Here is why I think that. The deceased fired the taser at the cop. I think that will be the off.I actually watched a good bit of the hearing in ATL yesterday. Their case is going to be stronger than you think. Hard to say the cop felt threatened when he's literally just sitting there kicking a dead guy.
If I give you a pistol, then I shoot you with a taser. Do you think you could prevent me from taking that pistol away from you? I'd bet you could not. I think there will be a reasonable argument that the officer knew that too. I can see the cop being guilty of manslaughter.