Originally Posted by captain planet
If someone comes at you with a knife and you point a gun at him, he is very unlikely to keep coming, and far more likely to head in the other direction, perhaps in some haste, if he has a brain in his head. Only if he is an idiot are you likely to have to pull the trigger. And if he is an idiot with a knife coming after you, you had better have a trigger to pull.
This guy, apparently, has never talked to a cop about this. They're instructed to shoot if someone with a knife is less than 25' away and advances toward them. Someone who wants to use that knife can cover a helluva lot of ground in a very short time when they're on a mission and they don't always care that the other person has a gun.