The picture of the LE response shows a picture of heavily geared-up guys striding onto the scene after the fact. Good PR photo but that's about it. No matter how good their reponse time might be, it's not quick enough to prevent the emptying of a couple of magazines. If anyone engaged the shooter, his actions would be, at least, influenced and he might even be stopped. The truth is, any response is better than none. Of course, response is just that and is, by it's nature, too late. GD