Kyle's muscles begin to tense of their own accord, the result of years of training and combat. He intentionally keeps his hands in his pockets, to appear less of a threat as the rest of his body readies for a potential fight.

It's a gray area he hasn't encountered yet. Human blood, not from humans. Natasha manages not to feed on humans at all, but he doesn't know if all of them are capable of that. And it's a hell of a lot better than feeding on actual people. But it still puts humans at risk, in an indirect way. Not having enough blood in a bloodbank is a separate risk.

He's silent for a long time, long after the walk sign clicks over to walk and a couple people wander by. Hands in his pockets, body still, not taking his eyes off of her.