THIS is the terrifying moment a shark almost ripped off a teenager's hand after snatching his fish and and dragging him through the water for 20 metres.<br /><br />Jahmon Wilson, 18, had just caught a large kingfish in Nelson, New Zealand, when the "ballsy" bronze whaler shark encircled him.<br />Nearby spearfishers had warned Jahmon that sharks were approaching after his successful catch.<br /><br />Before the teen had a chance to gather his gun and head home, the water turned white around him and the shark grabbed his fish, missing his hand by only a few inches.<br />Then, while still clutching his speargun, the shark dragged Jahmon through the water for 20 metres before severing his line.