From Inside Edition.

Paul de Gelder lost his right hand and leg when a bull shark mauled him back in 2009 in Australia. Now, de Gelder is hosting a dramatic stunt for Discovery’s "Shark Week" on how to survive a shark attack. He tells viewers what they should never do if you see a shark: put a limb in the water. To demonstrate, he lowers his prosthetic leg into the water; almost immediately, a school of tiger sharks appears. One of them rips off the prosthetic, releasing synthetic blood in the water.