The officer was within arms' reach of a handcuffed, non-violent offender, and decided to, without warning, shoot her with a taser. It was careless and, given the other options the officer had and the severity of the crimes committed, it was vicious. It also seems like his use of the taser, given the situation, was illegal. It also appears as though this will lead to the woman's death. Strangely, everything I said is spot on. So, should the officer be held responsible for his crimes?
Simple answer: No. (because he did nothing wrong, but that's already been beaten to death)