As Bucky calmed down, Steve's heart stopped pounding quite so hard, although he was still concerned. He nodded, although he was still watching Bucky closely, trying to keep his own breathing slow and steady so Bucky could mimic it. If he stayed calm, it would help Bucky. Slow breaths in, slow breaths out. "Good. That used to work for me," he said, with a small smile.

"I want to call you a doctor. But we're going to wait until you're okay, okay?" Because he didn't want to panic Bucky all over again. But he did want to get him looked at. "I promise, I won't make any calls until you're ready." Or until he passed out, but Steve was hoping that wasn't going to happen.