It's absolutely no vindication or excuse for the police - I'm appalled by all this, but did the guy have a known history of heart trouble, that might have led him to be on blood thinners? That might have exacerbated any bleeding.
I'm ashamed to think our police can act like this. Even if they were being provoked (I haven't heard the video of this event clearly, I did wonder if he'd told them to feck off or something, otherwise I can see no reason at all to push him over), they shouldn't give in. If any of us did that, we'd be arrested. That other incident is the same - the girl who was slapped was apparently deliberately shouting at the copper to provoke him, but he should have been able to rise above it. Isn't that what they have training for? I see stuff on telly (Traffic Cops and the like), and think, if that crim said that to me, I'd smack him one, but I expect better of the police.