No words, Just Relief and Regret

The bright orange light of the energy field keeping Barriss in her cell was her only source of illumination. Not that she had much to do while the Jedi Council discussed with the Senate what to do with her, but when there's nothing to do but contemplate how your plan to blow up the temple and pin it on a fellow Jedi blew up in your face, it's easy to see how the anger can fester. But anger wasn't what Barriss felt, more like disappointment, at herself for getting caught, at the fact that the Jedi would never listen to her now and at how they would continue the way they are, the way they've become over the course of the Clone Wars, soldiers whose only purpose was the continuation of all this fighting, fighting that they could lose not only the control of their emotions that was important to the Jedi way, but also themselves, the very people she had grown up, trained and served beside as peacekeepers almost all her life.
And now those same people no longer see her as Master Luminara's dutiful apprentice, the skilled Jedi healer. She saw it in the eyes of the temple guards. Behind their blank masks as they escorted her to the courtroom and to her cell, that look they all shared, was enough for her to know what the rest of the order would see were they to look at her now.
'Hypocrite'  'Zealot'  'Darksider'  'Terrorist'  'Betrayer'
Any chance for her gaining support from her fellows had almost completely evaporated when Skywalker caught her with Ventress' blood red sabers, even those who shared her views would just see her as the Jedi who went too far and fell to the dark side. Not even Luminara had sought her out after the trial, or if she had tried, the Council had stopped her. That possibility was unlikely though, despite their partnership, they had kept a professional attitude towards each other and their duties, not letting their feelings get in the way of their judgement. No doubt she felt disappointed that Barriss had chosen this path, but she and the others wouldn't have understood, she did what she did because she felt there was no other options, the Council most likely would have just brushed her off had she voiced her concerns, in an attempt to 'put her mind at ease'.
No, action was the only way to get their attention, the only way to get them to listen, to understand. The same has been true so many times in the past, forcing others to listen because the person or people they once ignored are now a threat. People will always get caught in the crossfire (or the blast in this case), Barriss knew that that was unavoidable. If it was, Tutso would still be alive.
Sighing heavily, Barriss laid down on the cell bench. Staring at the ceiling, Barriss found herself struggling with the fact that the people she'd grown to respect and trust have, and possibly will, be harmed as a result of her actions. As necessary as they were, it doesn't change the amount of sorrow and regret that comes with seeing a friend suffer because of it, it doesn't change the fact that you betrayed someone close to you. And now there was nothing that could be done about it, Tutso is dead, practically by her own hand, Luminara was no doubt struggling to put the pieces together, to point to where things went wrong, and Ahsoka...
"Ahsoka..." was the only thing to escape Barriss' lips. Her togruta friend, the one she tried to pin all this on, was no doubt suffering the most from all this, after being kicked out the order so that she could be tried by the republic courts. Barriss had heard a rumor that Ahsoka was offered a chance to return after she was proven innocent, an offer she turned down. This didn't bring Barriss joy or anger, it was what it was despite the fact that she was partly responsible for that decision.
The hurt Barriss felt swelled, she owed Ahsoka twice over. Nearly suffocating to death under the rubble of a destroyed weapon factory wasn't exactly fun, but at least Ahsoka had been there, her being there with her was a comfort that helped her face what then seemed to be inevitable, and in the final moment before they were rescued, no final words were needed.
And then there was that time with the Geonosian brain worms...
Barriss rolled onto her side and curled up, the memory of that time was still painful...
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Barriss stalked the halls of the medical transport, her quarry not far ahead.
"You can't hide from me," she hissed, the words not her own, each step she took not her own, the worm in her head pulling her strings like a parasitic puppeteer. Spottimg Ahsoka, Barriss drew her lightsaber and gave chase, but in her mind Barriss was begging herself to stop, begging Ahsoka to stop her.
Turning a corner, she saw the Togruta stubble and fall. Fanatically, Ahsoka turned to face her possessed friend.
'Run Ahsoka!' Barriss' mind screamed as Ahsoka tried to crawl away, pleading for Barriss to stop, but the worm in Barriss head made her advance, lightsaber at the ready.
"Barriss! Please! Don't!"  Ahsoka begged as Barriss stood above her, bringing her lightsaber above her head, ready to deliver the death blow.
'NO!'
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"NO!" Barriss  jerked upright, hyperventilating as her mind began to process that fact that what just happened was just a dream.
"Hey," a familiar voice interrupting her train of thought, Barriss turned to see Ahsoka sitting at the side of her bed. Relieved that her friend was alive and well, Barriss slowed her breathing.
"The worms are dead" Ahsoka stated, resting a reassuring hand on Barriss' shoulder. "I made sure of that."
"How...?"Barriss stopped herself, remembering how their ship's  cooling systems went haywire, Ahsoka's doing of course. But the relief of seeing her friend alive was quickly replaced by feelings of guilt at nearly killing her. "Ahsoka, I..."
"It's alright Barriss," Ahsoka smiled, "It wasn't your fault."
This didn't exactly ease Barriss' mind, there was a look in Ahsoka's eyes that told her that her friend was feeling similar emotions to her, relieved that her friend was alive, but there was something else..
"You didn't kill me," Ahsoka looked away as Barriss said it, visibly pained with remembering how Barriss had begged her to do so.
"I couldn't," Ahsoka's voice cracking, she began to speak more quickly, "not when I knew there was another way, I mean the thought crossed my mind but your my friend and I...I..."
Tears were all that followed, now it was Barriss' turn to placed a reassuring hand on her friend's shoulder. The friends looked at one another, there were no words.
There was only relief they were both alive..
And regret from attempting other wise.
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Relief and Regret. Barriss stared back up at the ceiling of her cell, finding it funny that that was all that probably left of their friendship, at least for her. She was relieved Ahsoka wouldn't be executed because of her, and regret, well she did try to frame her for all this, regret for that would have inevitably, no matter the outcome.
But despite the regret, Barriss couldn't see what else she could have done. She had wanted to show Ahsoka, through all this, that the Jedi, the council especially, couldn't be trusted anymore. And it worked after all, the council threw her to the wolves without much regard for her, because they were more worried about what the senate would do if they didn't, they just wanted to save their own skins than proved Ahsoka innocent.
But it was better that Ahsoka now know, than live simply following the orders of a corrupt council and a reckless master. Barriss was always cautious of Skywalker, ever since they first met on Ansion, he had always been aggressive and impulsive, always doing things that flew in the face of the Jedi code. These traits were as clear as crystal during their duel at the temple, especially at the end, where he completely let loose, in front of younglings no less, and no one cared because she was the enemy. It was good that Ahsoka left, she had learned too much from him, how long before she had become like him, always skirting too close to the dark side.
The thought of Ahsoka becoming something terrible chilled Barriss to the bone. For as much as people said she had fallen, she would never wish it upon her closest friend. The path she has now walks is one she took out of necessity. It's why she confessed at the trial, she hadn't fallen so far as to not do the right thing to save her friend from  execution. She hadn't fallen so far as to abandon her friend.
This thought brought forth a torrent of 'what if's'. What if there had been another way? What if she had convinced Ahsoka to join her? What if the bombings had failed?
Barriss shook these thoughts away, it couldn't be helped now. What's done is done, there could be no turning back. The jedi are still corrupt, the Republic was failing, she'd been exposed, and those close to her were either dead or no longer trusted her. And Ahsoka, who had been her friend through thick and thin, had walked away.
In the end, there were no words.
Barriss was relived Ahsoka had the chance to walk her own path, free from the Jedi...
But she regretted how she had to suffer at the hands of a friend, Barriss' hands, to do so.