Jacen didn't react right away, she deserved that anger and grief, he knew well what he had taken from her and there was nothing he could do to take it back, or change it. But she wasn't attacking. She just held the lightsaber there before finally asking him if he felt remorse. Hard question really. It was complicated because of course he was sorry for Isolder. It had been unfortunate and he'd rather he hadn't done it. But for the rest of it. For his choices. Yes he knew it had been evil. He'd done things, horrible things. But he'd done it for what he believed were good reasons. He supposed that didn't excuse it in her eyes though. It might not have in his. He supposed there were 'reasons' for everything if one looked hard enough to justify their actions.
"I regret that I killed him" he said, watching her carefully trying to read her. He could always read Tenel Ka. Much as she so rarely showed emotion, Jacen could see the hurt she was burying behind the fury. "Of course I never wanted to any more than I wanted to kill Mara. I thought it was the only choice at the time."
The lightsaber was switched off and again he didn't stop her as Tenel Ka grabbed him and let the fury out just in a moments lapse telling him that if she ever saw Caedus in him he would die. And powerful as Jacen was in the Force he believed every bit of it. She was giving him a chance. One single chance to prove he could be who he was, and he was going to take it. He nodded once as she let him go and placed the veneer of calm back on. That would be the only show of emotion that there was. "You won't see him" he told her, fixing his shirt back in place. "I'm going to take this chance. But I'm not going to lie about the things I might have done in the past either. There's little point."
He'd show her this world, He'd be there for her in whatever capacity she could stomach with a man who had done so much to her and caused such trauma in her life. "Now, I'm sure you have questions about this place, or if you'd rather I just go I can do that too."