I found this at the nhbgear forum.
The grapplers (in the video) arent being realistic. And what grappler do you know is going to constantly go for a take down over and over again against a guy with a knife. If i trained with them they way they train (slap boxing)for many years and you put me in front of say a Luis or a Paul Sharp (any SBG instructor) my ass would be handed to me 10000 different ways. They are going to wind up getting someone hurt with a false sense of security.