"Do you even need all of the details to care?" Childermass won't quite snap back, but it's close. It's just that his anger doesn't involve yelling, it more involves getting to his feet and striding right over to get up in Strange's face. There's no need to get physical, all he has to do is loom. He's good at that.

"You should be so keen on preserving it, else you lose everything you've been working towards, everything I've been working towards," because, yes, this is quite personal. "Why even bother saving me if you're going to destroy the world I know in the process?"