Something is wrong here, does the guy look drunk, you can hear very clearly does he say anything, it appears he looks at the guy but does not do anything then the guy gets up and pops him, why did he hit the man, what did the man do besides look at them? The man appeared peaceful enough.
You missed the whole point that he was blaring music to disrupt their praying.
The earlier portion of the video had other people in the area looking up the road in the direction from whence he came, as did the left hook guy. It seems fairly clear that mohammad was causing a disturbance while still on the approach, even if the video didn’t show specifically what it was.
There was a leadup. Notice the guy who delivered the knockout blow was looking to his left out of frame a good while before the hittee entered the picture.