Bad beats in the middle of the street

The driver of a truck is starting to be beaten by a man who is believed to have stumbled on a highway to London.

After a few blows, he took his belt off his trousers and tried to hit it but failed to make it work.
The video taken by the second floor of the bus shows them fighting as a biker enters the middle, apparently able to stop the beat.

There's no known reason for the fight, which has been posted and is taking walks on the social network.