And based on what we know, what do you think the answer is?
Face to face, with a struggle over the taser and it would be a legal shoot. There is plenty of precedence for officers firing in self defense in those cases. In this case he basically will have to justify that the suspects actions (still unknown motivation) indicate he will likely pose a threat of serious injury to the next officer he meets. There is a big difference between running and fighting, and tome thing happened for a couple minutes before the shots were fired.
One of the negatives to Garner v. TN is that it was a judgement on a negative finding that was way out of the range of their ruling. This shooting isn't like Garner, because there was a physical confrontation.