I want to say I'm suprised about this...According to the local police they've never heard of anything like this happening before. I'm really not though.
It seems the two people have been fueding for a while and this was just the boiling point where someone who is clearly not mentally sound just snaps and tries to commit murder right there on the spot, even pushing the poor dudes mother out of the way so he can get to the stabbing. He also had a gun which barely missed it's shot.
What's weird to me is how he busts in with a knife and a gun. Almost like soemthing you would do in a regular Call of Duty game.
edit: Unsure if this should go to off-topic but if someone with the power do to so feels it should be moved please go ahead.