When people catch and release fish and hold the fish out of the water too long (taking pictures ect.) the fish sometimes seems dead when put back in the water, so many fishers run water through their gills, then they spring back to life and swim away, so i can see how the power head method worked!

but ive also seen invers (new) drop "dead" to the bottom and after a few seconds JUMP up and flip over fine and dandy. lol