Clearly, Rogers is still getting acquainted with his new capabilities during this New York pursuit, literally stumbling into many obstacles, but he gets the hang of it quickly and even runs an impromptu shield test by deflecting a bullet with a freshly ripped-off car door.
One of the most pivotal moments of Steve Rogers’ superhero evolution occurs immediately after he gets “taller” in Captain America: The First Avenger, chasing down an undercover HYDRA agent who steals the Super Soldier Serum and murders Dr. Abraham Erskine (Stanley Tucci).
After all the death-defying excitement and the caught HYDRA agent’s death by cyanide, Rogers then begins to take in what he has become, reflecting that his motivation to commit to this heroic act was purely out of heart and not from what “came out of a bottle.”