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But would that fish eat a human if they were swimming around out there around the boat? I assume they would if the person were the size of that shark (or smaller)?
Do you really want to know the answer to that?
Odds are that the grouper followed the shark up to the surface. Grouper like that are lazy. Seriously they can be lazy lazy. The odds that one would swim to the surface to attack something of that size aren't too high. Assuming the water wasn't too deep and something (someone) was thrashing about (playing) at the surface it might come up to investigate what might sound like a wounded fish.
Honestly I trust shark more than I do grouper. I fish in the water all the time around shark. I regularly have them swim within 10 feet of me while I'm out in the surf. I promise you that if you have spent any amount of time in the surf you have had them swim that close too. That goes for pretty much all beaches that don't have shark nets around them.
There are tons of shark out in the water close to shore. When I fish for shark from the beaches I often times will make a drop 3-800 yards out but often times can catch them within casting distance from the shoreline (75-100 yards). Not trying to scare you but the shark are out there everywhere. In Florida we would catch decent sized ones around 7-9 feet within 20 yards from shore.