Slighty back on topic (defending against "The evil grappler™")
What worries me is when people points to techniques like the one you can see in
this clip (1:37 to 1:44) as takedown defense (as I have seen posted in another forum), especially when they haven't trained it against competent resisting opponents in alive settings.
IMO, giving technical advise about sd/fighting without checking if the technique works in a realistic environment is irresponsible.