Lost fin at the beach

This is a very unique story as I almost never encounter such a thing at the beach. I don’t know Heath, but I happen to grab a few photos of him and his cousins. Heath has a unique-looking diving fin that grabbed my attention. While later, I noticed Heath return alone with one fin. Heath kept looking around for those fins with no luck. I thought I might help by using my long lens and look around the longshore but had no luck.