Dave Freeman, a diver spearfishing in Hawaii out swims a shark. He says at least two sharks were fighting to eat his collection of fish.
So Dave started swimming towards a shallow reef to get a way. While he moved Dave kept feeling a tug on his green rope. He explains at this point his heart was racing. He didn't want to hurt the shark so he slowly pulled on the line until the shark came to a rest on a reef.
The shark was free and Dave was free.