Presumably they’re not frozen in time. The post was made a day ago, so at least several hours before your comment, and the picture was probably not taken minutes before the post was made. I’d imagine they got out of the water long before any of us were aware that they were ever in the water. And given that the picture isn’t accompanied by a second picture of everything in the water or a story about them falling in, it’s reasonable to assume that nothing as notable as that happened.