This appears to be a excessive, but looking at the situation glass half full at least he didn’t get shot or choked to death.
Thabo’s teammate Pero Antic was already cuffed on the ground when Thabo who doesn’t seem to be making an aggressive move get rushed by the 6 cops. One cos puts his hands around his throat while the rest help wrestle him to the ground. Even though the person taking the video is french you can clearly hear people saying it is messed up what the cops are doing. I agree.
The reason Thabo Sefolosha broke his leg is because 6 cops basically chokeslammed him to the ground as you can see in this video provided by TMZ.