Police say Will probably helped save the man's life too, because he was badly hurt and was struggling to stay afloat.
Will, who's from Cheshire in the north-west of England, said: "I've rowed since I was four so naturally when I got into the boat I took control. But when we got close to the man I started to get a bit worried."
Pc Mike Dawber was one of the policemen at the scene. He said: "Will told us that he was an expert rower and he was happy to take us out into the middle of the lake. I wasn't going to argue with Will."
Unfortunately after the man had recovered in hospital he escaped, and is now thought to have left the country.