WARNING: graphic image below
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It sounds like a scene from a horror movie. You wade to shore after bathing at a Melbourne beach to find your legs are covered in blood.
You try to staunch the bleeding but it won't stop.
But that's exactly what happened to Sam Kanizay, who fears he was attacked by tiny marine creatures at Dendy Street Beach in Brighton.
The 16-year-old, who was sore from playing football, was soaking waist-deep in the bay about 6.20pm on Saturday.
His legs felt a little numb, with a tingling sensation, but he assumed it was from the soreness and cold. "I wasn't really thinking about being eaten."
Emerging from the water 30 minutes later, he saw under a street light that his legs were covered in blood from the calves down.
"My first instinct was that I must have stepped on a rock," he said. "But I realised that couldn't have been it, because it was evenly distributed over my whole ankle and foot."
He walked across the esplanade, "leaving a path of blood", to his home nearby. His father, Jarrod, and sister, Gabby, 14, tried to wash the blood off in the shower.
They couldn't staunch the flow, which seeped from pin prick sized holes, so Jarrod drove Sam to Sandringham Hospital emergency department.
Sam was given painkillers and antibiotics and had blood tests.
Jarrod drove him to Dandenong Hospital in the early hours of Sunday for further tests.
On Sunday afternoon, Sam's legs were still seeping blood but doctors had not found a cause.
Sam said a nurse had suggested sea lice were to blame, "but it was just a guess".
In winter of 2015, a suburban newspaper reported that Nick Murray and his son Will, 13, bled from their feet after standing in the bay at Sandringham for 10 minutes.
The pair thought it was sea lice - marine parasites that feed on fish.
University of Melbourne marine biologist Professor Michael Keough said sea lice were a possibility. 'They're scavengers who'll clean up dead fish and feed on living tissue. They're mostly less than a centimetre long, and so the bites they make are pretty small, and so that's more consistent with pinprick size marks."
"It's just food for them. Especially if he's been standing around for a long time, it's the chance for more of them to come in and start biting. Just be attracted to a little bit of blood. And if he's standing in the water and he's cold and may not notice a whole lot of little bites."
Doina Canta, who goes swimming with the Icebergers every morning off the beach where Sam got injured, says it could be a sting ray. She said a man in her group got stung about six months ago on one leg, and had bled extensively.
Sam Kanizay was still in shock on Sunday but it hadn't put him off swimming in the bay. "It was a bit of a freak thing to happen. I'm not really sure what to think of it."
Sam's father Jarrod Kanizay warned in an email that "something ate Sam's legs. If you are a member of the [Brighton] Ice Bergers [swimming group] or running groups that ice their legs at Brighton, then you may want to repost this to warn them to not stand still in it too long..."
A spokeswoman for Monash Health, which oversees Dandenong Hospital, said the patient was still being assessed and it was too early for a doctor to comment on the case.
Jarrod told The Age that at Sandringham Hospital "We had the emergency room full of everybody that was working there just fascinated, they were all on Google afterwards, hypothesising as to what happened. They pretty much had 10 different hypotheses but nothing yet."
Jarrod said he and his friends often soak their legs after a run, "and I haven't seen this happen before".
He said he was considering putting a bloodied piece of meat in the bay on Sunday night "to see if we can catch these things".
