Greg Potter was fishing off the coast of Waihau Bay in New Zealand when a shark rocked his pedal boat. But the shark was not assaulting Potter; it was chasing a seal. In the aftermath of the encounter, he told reporters: “When the seal hid under the kayak, the shark came crashing up from underneath and smashed into the bottom of the kayak. Then they did another few laps around the kayak, and then…