Probably right. I should add to my further post that I'm not saying that anybody should have tackled him, just that I'm surprised nobody did.Probably that's exactly what all of them were expecting, too. Unless you happen to have a baseball bat about your person, it's a bit of a tall order for anyone untrained to take on a killer armed with a large knife.
I've been the type of guy to walk toward the guy with the knife/crow bar/brick/etc. in the past without really thinking it through, as I've had know training. Luckily I've never been badly hurt each time, and it should be said that those guys have always been threatening rather than just acted out any threat.