Near the end of The Meg, thousands of visitors are in the waters of Sanya Bay. Most are floating in colorful inner tubes. When they spot the giant shark, nearly all of them swim towards the beach in a panic. However, a group of about 50 stay clustered together without swimming towards the shore. The aerial shot looks like this:
Why did everyone in that group refuse to swim to shore? They were strangers, as shown by the one kid who nagged his mom to go swimming; he didn't know any of them. If it was just a group of strangers who couldn't swim strongly enough to get to shore, it doesn't make sense that they would have all been in one place. If the Meg had separated them from the rest of the group, some of them would have swum for shore when the Meg passed. Is there an in-universe explanation for the group staying where they are?