It wasn't like Steve to be so reckless. With his own health, sure, but he had often refused to go out when he had a bad cold so that he didn't infect anyone else around him, but here he was saying that he would be fine taking a possibly unknown pathogen just casually out into the population.

Bucky frowned, half concern and half squaring himself up ready to argue his case, when Tony suddenly appeared in the doorway, which meant that Tony got the full brunt of his scowl.

"His name is Steve, Tony. I like you, but if I think you're disrespecting my friends, I'll still whip your ass."

It was a shorter response than he intended it to be, but he was so on edge. If he were in his right mind then he might realise how weird it was that Steve hadn't noticed the signs of him in distressed, his fingers clenched into a fist, a slight tremble to his frame, the way his muscles have gone rigid.