I haven't really followed this story or seen the video. But from reading the article at the top of the thread, it sounds like a man at his own home got into a street fight with three other men who arrived at his property.
Self defence sounds plausible.
But the bottle of amonia and a slash-hook? Who keeps that at home?
I'm sure no-one is completely innocent, but I would say if you show up at someone's house armed with a knife or spade and you come off the worse for it, it's difficult to have sympathy.
Maybe that's harsh as I don't know the story, but it doesn't seem like a clear case of murder to me.