In 1993, I was fishing off a charter party boat off Oregon. The crew must have killed at least 50 small sharks and an equal number of mackerels that day. They unhook them, and whacked their head against the boat several times, before throwing them back in the water. I thought that it was a waste of resource. We kept only the seabass, and lingccods. The untintentional catch are killed and thrown overboard.
Eventhough some on scubaboard frown on handling any type of interaction with sealife, what this man does is no worse than what is done daily on charter shark fishing boats, even if it is catch and release - these boats man handled the shark more than what this one person did.
To be honest, I might try to catch a shark by hand too, if I knew I could get away unharmed. Steve Irwin wrestled with one while it was hooked, but it was about 6 ft long, and that is idiotic.