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Captain John Brossard sailed out with his crew from Goodland, Florida, and managed to hook a blacknose shark, but they weren't the only ones eyeing it up.
Brossard spotted three Atlantic goliath groupers (Epinephelus itajara) lurking below their boat, waiting to pounce on the shark.
In the video, the fishermen seemed visibly excited once they'd spotted the groupers, waiting for them to attack their prey.
Eventually one leapt out of the water and nabbed the shark in its jaws, plunging with it to the bottom of the ocean and snapping the fishermen's line.
Brossard estimates the shark was about three feet in length, while he reckons the grouper weighed 500lbs.
He said: "Basically we were shark fishing when all of a sudden two or three goliath groupers started hanging out under the boat waiting for our catch to come in.
"We were just thinking 'wow, unbelievable! Something is going to eat a shark and it's bigger than a shark.'
"We were very surprised. Basically it ate the shark, and took down and broke the line.
"We were using a 50-pound test line and that was not enough."
It's certainly a privilege to see the natural world in action like this, but the main thing Brossard seems to have taken away from the experience is that sharks aren't all they're cracked up to be.
He said: "Do they deserve all the hype?
"I think sometimes yes and sometimes no, but most of the time, no.
"Of course, if you get in their way, in their territory and the water is dirty, yes, they will taste you to see if you are good eating."
Brossard says that out in the Florida Everglades, such sights aren't even all that uncommon.
He continued: "There are sharks, alligators, crocodiles, pythons, dolphins and manatees all in one place.
"It's the only place in the world that has all these creatures in one place and everything there tries to eat everything else.
"Bull sharks have been seen getting eaten by crocodiles and alligators sometimes, and sharks also get eaten by bigger fish there."
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