C.S. Kim Karate schools teach self-defense grabs, and I assume they're traditional TSD, though it wouldn't change my training at all if they had a different origin.
Self-defense grabs involve partners taking turns grabbing each other's wrists, sleeves, etc. and responding with an escape and counter (and often a throw). Basic combinations are simply escaping the opponent's grasp and striking back, but some of the higher-level ones focus on precise grabs in order to put pressure on pressure points and (were it a real situation) break bones. I seem to recall an article in a martial arts magazine (Black Belt maybe?) where Choong Jae Nim demonstrated one of these; it was titled "The Big D" or something to that effect.
Anyway, my sa bom nim told me that originally all blocks were meant for starting grapples. A high block would not only defend from a strike but allow the defender to grab his attacker's arm and counter.
I hope this does something to answer your question.