Watch a kayaker kick a tiger shark that rammed him in Oahu, Hawaii

At first, fisherman Scott Haraguchi didn’t know what was going on when something bumped into his kayak off Oahu.

“Heard a ‘whooshing’ sound, looked up and saw a wide brown thing on the side of the kayak,” Hagaruchi wrote about the video posted by Hawaii Nearshore Fishing. “Thought it was a turtle at first.”

Then he realized a tiger shark had rammed his kayak. He kicked the shark away as it continued to attack his kayak, the video shows.

“Happened so fast,” he wrote. “Didn’t realize I took my left foot out of the water to brace myself from impact and actually pushed the shark’s head off with it.”

In the video, the shark swims away as a startled Haraguchi shouts “Tiger shark rammed me!” to a fishing companion. He’s so charged with adrenaline that he has to repeat it to be understood.

Haraguchi told KITV he later spotted a wounded seal that he thinks the shark may have been chasing.

Tiger sharks, which reach up to 18 feet long and 2,000 pounds, are the fourth-largest kind of shark, behind only the great white shark for size among predatory sharks, Oceana said.

“Tiger sharks are aggressive predators, famous for eating just about anything they find or are able to capture,” according to the organization.