See what happens when a dummy hand is swept underneath the stream of an extremely powerful water jet. If you woke up today planning to stick your hand underneath a 60,000 PSI waterjet, you may want to reconsider.
"You'd be missing the tip of your finger."
"The bone would still be there for the most part."
"It even took a little chunk out of your bone right here, but your flesh would most definitely be either hanging off."
Tl;dr: The dummy hand was immediately torn down to the bone. Yikes!