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After reviewing the footage of the incident and speaking to the cameraman who recorded it, cameraman and spearfisherman Ben Cropp speculated that the stingray "felt threatened because Steve was alongside and there was the cameraman ahead..." In such a case, the animal responds by automatically flexing the serrated barb on its tail, which is up to 30 centimeters (roughly 12 inches) in length, upward. In this case, the motion struck Irwin's chest and pierced his heart. Crewmembers aboard his boat called emergency services in the nearest city and administered CPR as they rushed the boat to nearby Low Isle to meet a rescue helicopter. Medical staff pronounced Irwin dead when they arrived a short time later.