He attempts to laugh, because the answer to that question is something along the lines of "not at all", but clearly that's not an option, and his attempt falls flat. "Whatever option gets both of us out of here in one piece. But-"

She's not going to take this well, but he has to put it out there anyway. "Look, I'm just gonna come right back if the worst happens. It's not the end of the world." It's probably more than a little wrong to discuss death in such flippant terms, but he's trying to impress upon her the idea that he'd rather die than put her in the position of having to torture him.

"You don't even have to look." And honestly, he'd prefer it if she didn't. No one needs that seared into their brains.