Despite my strong opposition to the taser as a compliance tool (I much prefer old-fashioned force), this is a tricky case because the guy was handcuffed. He got squirrelly and started fighting.
[Hey, once I was rolling on the ground with a handcuffed man. What could I do? He already had his hands tied behind his back and I still couldn't get him back under control.]
If you strike a handcuffed man, you're begging for a lawsuit and assumptions of police brutality. That's why departments love tasers. It makes it seem more legit. But if they just hit the guy, he's still be alive. Damned if you do. Damned if you don't.