Andy, of course it's not possible to get the whole story from that video but the Po-lice never 'needed' to taser anyone before! I don't think it's good that this is becoming routine to the point that you can see it eventually going uncommented on.
Also it looks like the guy is resisting being tased, which seems fair enough! And they're asking him to put his arms out (why?) when obviously he's just been electrocuted and seems to be holding his chest. He looks drunk / messed up but like you say he doesn't seem to be that much of a threat to four of them.
The punching looks like some kind of 'special' punching they've been trained to do. Which raises further questions about what exactly is going on with Police training right now.
Honestly there may well be more to that story but we need to be really careful about the creeping normalisation of that kind of thing. It's not like drunken twats have suddenly got a lot more dangerous is it?
Sorry yeah, you're right - I guess I was playing devil's advocate, or at least putting forward the sort of argument one might expect from someone defending the police, but that's probably not the best way to deal with the situation.
(To clarify, two of my friends had a massive row about the taser video while we were hanging out on Friday night. I largely stayed out of it, being too tired/drunk to contribute much. But the point is that the sort of defence I mentioned does exist out there).
I'm very much concerned about people becoming accustomed to the routine use of tasers, which I'm not at all sure should have been permitted for use in the first place. Also in this specific case, I think we can safely say that it was totally unnecessary (and potentially dangerous) to use the taser on someone twice in such a short space of time. Many was already out of the game.
Getting him to put his arms out was so he could be cuffed, I assumed. Though i/r/t your point about the punching method, it might just be how they are trained to proceed, putting the suspect under a set of commands so as to control them.