- When a triangle choke was attempted: Before the choke was cinched in the person in the choke bit the inner thigh and then hammered the groin of the grappler and then stood up.
This is the sort of technique that gets created by someone that doesn't know what they are doing on the ground. If you are in a decent triangle choke you aren't biting anything. But you are going to go unconscious without a proper defence, and if the last thing you do before going unconscious is try to bite a chunk out of the persons leg I imagine that will make waking up after less pleasant.
Not only that... you are on top. If you are fighting someone that knows how to wrestle and you don't, you'll be on the bottom
- Off of a double leg (Paul Vunak's Kina Mutay): The person being taken down wraps the grappler in a guard, holds the grappler's head tight, and bites into the grappler's cheek. When the grappler pushes back, you release and stand up.
And at that point you've seriously escalated the situation. You might get out with a mouth full of cheek and make your escape, or you might wake up in the hospital with no teeth as they aren't going to take kindly to escalating the fight that far.
- Off a side control: Reach in between the legs of the person on top and grab and squeeze the groin to get your opponents hips up, either your opponent lets go or you have a chance to get your legs under and pull to your guard.
More likely that arm get pinned and you get smashed for attempting to grab their junk...
- If you are in a person's guard: Sit back, hammer or punch your opponent's groin. Stand up and get away. (Krav move)
Again, this is not going to have that effect.
The problem with all this anti-grappling stuff is it relies on you being in a grappling situation with someone that also doesn't have any skill in it. In which case fundamental grappling techniques and tactics will serve you much better anyways. If you don't know what you are doing and are facing someone who has a high level of skill they will be able to do all of that stuff to you, and you will end up pinned and unable to do much of anything.
So "anti-grappling" is really just dirty tricks to use on other non-grapplers that will escalate a fight to pretty serious levels. Once you take a bite out of someone or try to crush their testicles... that fight is ending in the emergency room for someone, probably both of you.
So you can train to bite, claw, eye gouge and make wine out of testicles. Or, learn some actual grappling, which will allow you to control things rather then simply escalate them and do so with a much greater likelihood of success.
Is there situations that might warrant that sort of thing? Sure, very extreme ones that most of us will never face, but they exist. But you'll amplify their chances of success greatly by stacking them on top of some solid fundamentals.