Isaac took in a big breath and blew it out as Cora asked Destiny for help to make them remember. Somewhere deep down he'd known that it would come to this...it was even what he'd been asking for. But now that the time was upon him and he was going to remember...to make sure Cora didn't (at least not today) it was scary. He was scared. He tried his best not to let it show.
Destiny agreed. His fate was sealed. But if it got them closer to Derek...it didn't matter what he had to remember. He moved in when she offered and sat down, seeming more comfortable than he was probably feeling. He shook his head to the offer of drink and when she continued on about one of them having to volunteer...he felt a groan wanting to escape. Destiny kept talking and it just got worse and worse... blood? He REALLY didn't want to do this anymore. If there was any way to go back, to just undo everything, he would. But no...
As Destiny walked out to give them time to talk his gaze lingered on the knife she took with her. But when she was gone he didn't waste a moment to hiss a sigh "Great... yeah it's me. I'll do it."
He turned to Cora before she could protest, looking sure of himself "I promised Derek that when this happened i'd go first. I'm not going back on that now. Plus... I have less time to go through, it'll probably be easier." He was obviously nervous, but it was true..or rather mostly true. He made Derek make him promise. He just wanted to be sure Cora didn't have to do anything she didn't want to do before she wanted to do it. This would be the wrong time and the wrong reason, what if she got hurt? she had longer time away to remember and sort through, too. It just made more sense for him to go in every single argument.