So how did he trigger the shutter remotely? Alternatively if it was done using a long exposure why doesn't the water look different, and why isn't there a blue of him moving into position? Full disclosure, I'm a photography newb. If someone else operated the camera for him, is it still considered a self portrait?
I was wondering if that was the case with the water. Maybe it was just really clear. If he used an assistant, is it still a self portrait? Serious question.