Watch it again. At 1:30 they disappear around the corner of the building. At 1:32 the camera catches up to them and sweatpants dude has maneuvered past the kid but has stopped short of the door and turned to face off with the kid, who has his fist balled up at his side. The kid doesn’t start “raining punches” until 1:34. Maybe the kid threw a punch between 1:30 and 1:32 before the camera turned the corner, but it’s difficult to tell.
I could tell.
The kid needed a beatdown and the adult went easy on him.