I don't know that I would want to be thwapt by any mantis shrimp
I don't want to either, but I can't help myself. I have excellent insurance just in case. They just grab the shrimp and run. Used to feed my 36" Red tail catfish and pirana by hand as well.
And yes I would like to hand feed a Great White as well. However this would need to be done from the sanctity of a cage mind you, crazy not stupid.