I have scanned this forum and found a few posts on bear hugs but have a specific question for a particular and not uncommon situation:
Strong and quick bear hug from rear, arms are outside. Attacker quickly drops his weight, buries his head in your back to avoid elbow strikes, and blocks your leg at the ankle from behind and pulls you to the ground, hoping to land you on your side, but will accept pulling you down on top of him to beat you on the ground with excellent ground work.
This happens very quickly and at most you have one move to react to his one move of the initial grab. He does not try to pick you up, he merely wants to bring you to the ground quickly.
What counter move is possible in this situation which will prevent you from going down to the ground? Even a small person can "drag" down a larger person by pulling them backwards and downwards with their body weight along the weak axis of their stance. If you are not convinced of this, try it! To make your response reasonable, assume your opponent is bigger, stronger, and highly motivated (robbery, jealousy, whatever).
Please, no comments about being asleep or not letting someone get behind you etc. since there are many situations that might allow this type of attack (ATM line, you really are asleep , multiple opponents, etc.). Also, no multiple move techniques which require the attacker to stand by idly while you work him over.
You get whatever you could do in a fraction of a second before he can drag you down. Also, you, of course, don't know what he plans and shouldn't assume he won't pick you up etc. before he drags you down. Assume you have no knife in your hand, death ray gun, or superpowers.
One good workable move which could be executed by a smaller opponent which prevents you from going down...
Suggestions?