He had a fucking 2 inch swiss army knife.
Regardless of the 'entire story' - that does not warrant him being executed.
Yeah sure - there must be a reason - let's just hope these guys don't spot you with a toothpick one day and take you out.
2 inch swiss army knives can kill people. Did you know that if a man is wielding a knife, and he happens to be within 15 feet of you, there is a greater chance of him getting to you with his knife then there is of you pulling your weapon and defending youself. Its a big different this scenario because these hero's were already on target, but im sure you get the point.
Moral of the story : Pull weapon+Not comply with orders+scare cops=dead as fried fucking chicken.
My condolences nonetheless.