Panic attack because he saw and did wayyy more and was actually useful when some shh that neither of them had seen before popped up
I mean, what was cap going do with that nuke that was flying towards NY? Throw the shield Tony's dad made for him at it?
I mean cap went through basic training and then was a puppet AND then had couple weeks of war.. tony was a damn prisoner of war AND sacrificed his life for the whole of cap's precious NY to fly up into a hole where an entire damn army came out of.. I mean ain't like cap ain't spent weeks going in a gym beating up on poor punching bags cause he couldn't adjust