Looks like he lay down flat for a few seconds after he was tackled - then they started beating him.
I wonder how easy it is to lie still when men are beating you with nightsticks, and to put your hands behind your back instead of over your head.
In fact, he stops running a second before he is tackled, as though he decides flight and struggle aren’t going to work.
I’d still call the tackle fair, but nothing that follows.