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You're trying to judge the size of the dorsal fin and you can't see its base. That's the 'iceberg' problem I mentioned before. You have no idea how much more fin is underwater because its back never breaks the surface.
There were not two sharks, but you see the dorsal, and then the tail flicks above the water, and I suspect that was originally mistaken as a second dorsal fin.
I did, that's why I concur that was a huge shark.
Perhaps not a huge great white, but certainly a huge shark.