Remember that position if you or a loved one ever get your a$$ kicked by a jackboot who "misuse their power"...
Unless this guy was actually attempting to assault the cops, there is absolutely no reason for this type of response. NONE.
If the guy fled and "scuffled" (just another term for fighting) with the police, he was not cooperating for some reason. I repeat, he probably got what he deserved. Was it right? Probably not. But you venture into that territory of running from the police and fighting with them, you're going to run into some resistance. A good "scuffle" gone bad for the suspect.
In my almost 70 years, I have never been stopped by the police, much less arrested. That is not by luck but by design. I follow the law and wouldn't even think of fleeing from the police and fighting with them if they stopped me for some reason. If I did, I would get what I deserved.