Steve's mouth twitches and he's already taking Jack's answer as a yes before it's explicitly stated.

But any attempts at a smile, voluntary or involuntary, die pretty quickly when Jack explains they're turning into monsters. That they might have to fight each other. That... really doesn't bode well.

"You think you'll - we'll - all be at each other's necks, eventually?" he asks, though in a tone that says he's pretty sure he already knows what the answer will be. "You said 'some of us' - so it's not everyone?"

If there's something different about the people who are, versus the people who aren't...