During a previous dive, the Dive Master speared a Lion Fish in this exact spot. A couple hours later, we are back in the water and this guy shows up. He still smelled the essence of the fish that was killed and checked out each and every person in the water looking for it. Nurse Sharks are not known to be aggressive, and the're bite is far from serious. They have no real teeth: just two bony plates they use to suck up animals from under the sand. If they do manage to get a hold of you they leave a bad bruise or something akin to road rash behind.