Well- since we only 'join' the video after he's been striped and is on the ground in the snow - by this time, we could conclude he's already had some blows - he gets a punchered lung and broken ribs - ever try to roll over with broken ribs and a punchered lung? Then he gets tazed more than once - ever get tazed? How easy is it to move right after?
He's on the ground naked - how much of a danger can he be to a herd of armed men at this point?
If they can't take control at that point - they don't belong behind a badge. Lucky, I guess, he wasn't shot.
In fact if this guy was half as dangerous as dirtboy contends he was then by not shooting him they were clearly negligent in their duty by subjecting their fellow officers to imminent danger.