[QUOTE=Bomblaster]"chain-punching [AKA: straight-blast] is effective even against shark attacks"
From the repeated Discovery XMA "documentary":
"Two short sticks are primarily defensive weapons."
My N°2 Krav Maga Instructor:
"You have to have a very very hard groin to make it work".
(I was showing the armbar, drilling it with another student. Then I drilled it with this instructor. He tapped instantly. My groin wasn't particularly hard at that time.)
Sharks have a hard skin, 100% covered with tiny "teeths" to improve hydrodynamics.
Originally Posted by Bomblaster
Punching a shark is a painful experience.
Straight-blasting a shark "will skin your hands".
A single, powerful blow to the nose is the only way to deal with a shark when unarmed.
"I don't know if I would actually ever try this one myself..."
-- An instructor the other night being honest about a particular knife defense we were working on.