Don’t ask why, just watch!
Well, the players that you see in the video are.. let’s say, playing their part as actors. You would’ve noticed that his aim was Stormtrooper-like, so is his reflexes.
While the video was captured in-game, he the person wasn’t up against competitive players, as mentioned above, the players in the video are playing their parts as actors.
Gotta admit though, this person is awesome.