Percussion is slang. The “correct” name is overpressure. It is also referred as concussion as you most clearly pointed out. The slang term was derived from a combination of pressure and concussion. I should have known to be specific with an engineer.
It works off pressure waves created by the explosive charge. The overpressure damages the inner ear causing disorientation, and fatality if that is the desired outcome. They are more effective than stun grenades as stun grenades only effect optical sensory and recovery is commonly within seconds.
So, bad example after all. I tried to use common sense to demonstrate the effects of sound waves. I should have known better. I give up.
