"No. I can't just leave." They were here for a purpose. He knew it. And for once in his existence, he was actually going to try to live up to it.

"You're more than welcome to do as you like." Also he didn't know how they would manage to return. Go through the mirror perhaps? Do some sort of spell? He obviously shouldn't think about it but now he was.

"Anyway, I don't want to just survive it, I want to stop it." Though in both cases he wasn't sure how.