First of all, I need to point that the link posted does lead to a site with Adult material, but wanted to draw everyones attention to the knife assault video.
Do not follow the link if you are squeamish, as it shows a man in Holland repeatedly stabbing his girlfriend, while bystanders do very little to help at first.
http://www.nothingtoxic.com/media/1199672787/Man_in_Holland_Brutally_Stabs_his_Girlfriend_Repeatedly
Surely anyone with a bit of an MA game would have kicked his head clean off his shoulders?