Instead, it came from a close encounter with a humongous great white shark, estimated to be 18 to 20 feet long, that cruised within inches of one jet ski and forced the evacuation of the entire surf break.
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"This was by far the biggest and scariest creature I've ever seen in the ocean," surfer Drake Stanley said.
And he would know. As a big wave surfer and professional surf rescuer, Stanley has been in the ocean his entire life, diving and spear-fishing.
But he said what he saw Sunday was like nothing he had ever seen before.
It started as just another day out at Mavericks, where Stanley said he had surfed in the morning and was working as a jet ski rescuer for other surfers in the afternoon.
He told ABC7 News that he was sitting on his jet ski with the engine turned off around 1:30 p.m. by an area known as Mushroom Rock when he first saw the huge shark.
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"It looked like a whale," Stanley said.
He said the shark swam just inches under his jet ski, close enough for him to see the scratch marks on its skin and its dark gray eye.
"I could have reached out and touched it," Stanley said.
He said the shark was much longer than his jet ski and rescue board, so big that it didn't even fit into the frame for the one picture he was able to take of it.
But the frightening encounter got scarier when Stanley said the shark spotted a surfer paddling in from the Mavericks break.
"It saw the surfer and just made a beeline for him," he said. "I thought, 'I'm going to watch a shark attack.'"
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Realizing that the surfer had no idea the shark was out there, Stanley turned on his jet ski and revved it loudly several times in an attempt to draw the shark's attention.
It worked, and Stanley was able to scoop up the surfer on his jet ski. But the shark then started heading for the waiting lineup of surfers at Mavericks.
Stanley raced out to those surfers and alerted them about the huge shark, pulling as many as he could onto his rescue board and towing the rest in on their surfboards.
"I had like eight people in," Stanley said. "I basically evacuated Mavericks."
Great white sharks have been spotted before near the Half Moon Bay surf spot, and several surfers have been attacked. But Stanley said he's never seen anything like this before.
"The shark was definitely inspecting us," he said. "I'm not sure if it was going to attack that guy, but this was definitely the scariest encounter I've ever had in the ocean."
Pro surfers around the world reacted to the viral video, including World Big Wave Surfing Champion Grant Twiggy Baker.
"Such a rare and special moment in life when you get to share space in the ocean with one of these guys and learn your true insignificance," Baker wrote on Instagram. "Cherish it. It doesn't happen often."
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