“you ever jumped on top of a grenade?”
“yeah, actually I have, 4 times. it’s this thing i do with my helmet, it’s a reinforced helmet.”
that’s the difference.
in the first captain america movie, skinny steve rogers didn’t HAVE a helmet. he didn’t HAVE the serum or the shield or even like a decent uniform. he jumped on it, unarmed and instinctually because that was who he was.
having a reinforced helmet, knowing that you’re safe enough to do it one, two, three, FOUR times and not get harmed was not the point of the statement. it was about how steve had nothing and was still brave enough to put his life on the line immediately. it was about whether he had a good enough heart, enough courage and strength to do the right thing and sacrifice himself even though he had nothing to go gain in return, including a guarantee of his safety.