the subtext in this scene KILLS ME Steve clearly WANTS Sam’s help but doesn’t want to be the one to ask him to do it Sam is joking at first
there’s a twinkle in his eyes as he says that ‘captain america’ needs him when he clearly means YOU you steve rogers need my help
and he’s more serious as he continues that there’s no better reason to get back in that he believes in this fight ‘I BELIEVE IN YOU SO HARD STEVE’
and Steve can’t even handle it he has to look away ‘HE BELIEVES IN ME SO HARD’ I CAN’T EVEN BOYSSteve can’t ask him to help because the last time he asked a friend to help, that friend FELL FROM A FUCKING TRAIN.