Well, there's a $1,000,000,000,000 lawsuit in the making.

Both sides were wrong, though obviously one side more then the other. When grabbed by the cops, you don't fight back. They'll tazer/beat/club/mace/shoot you into submission as sure as night follows day. It's their raison d'etre. You fight back later after you've been released.

On the other hand, if the guy is cuffed and already been electrified and won't stand up, then you secure his feet with cuffs or quick ties and carry him out, you don't torture a non-threatening suspect him into compliance.