"It happened so quick he didn't even know what hit him and he just saw blood start pouring out, and that's when his family helped him back onto shore," first responder Sergio DeLeon told NBC-2. "It looked like multiple bites actually at least two or three bites," DeLeon said of Carsten's lower leg injuries.
Witnesses called emergency services at 4:30pm, and, according to Marco Island Rescue Department division chief David Batiato, gave emergency service operators different accounts of what went down. Marco Island Police, EMTs, and firefighters rushed to the beach, taking Carsten to a hospital. He was treated and released just a few hours later.
While it’s unclear exactly what happened, one thing's for sure: there’s definitely something in the water in Florida. And it wants to bite you.
Chloe Pantazi is an editorial assistant on Thrillist's travel team. Yes, that's a British accent. No, she doesn't watch Doctor Who. Follow her on Twitter at @ChloePantazi.