Steve was still gasping, but tried to answer. "It's... it's pretty empty... but it's the tall.. tallest building... in the world!"
When she gave the bad news, his eyes widened and he looked up at the sky. "But... but there's still people in there!" He looked back at her, his blue eyes filled with a grim determination. "How do we find them? What could do this?" Someone or something was taking people from his city, and Steve wasn't going to stand for it!
He wished that Bucky was here to help. Of course, Bucky would start off by telling Steve it wasn't his problem, that he should try and wait, that Bucky would take care of it on his own... Bucky wouldn't leave people in danger, but he'd be damn insistent that Steve stay out of it.
Well, that didn't work even when Bucky was around to make the argument. Steve wasn't going to stand aside when people needed help.