@whatnow123 after getting to his feet he pulls his taser. He sees that the perpetrator is incapacitated on the ground, hence why he doesn't use it, he understands it isn't necessary. At that point, he decides to kick them in the head and stomp on their head.
If he felt that the perpetrator was going to get to his feet, he would have/should have used his taser.
I'm possibly a little biased against GMP as my friend worked there as an officer for a few years until around 6 months ago. She left because she consistently saw male colleagues who were known to be violent promoted over her and other officers. She felt it was unconscionable to stay. There were other things she witnessed, which I won't go into here, but essentially my view of them as an organisation is already piss poor.