The 37-year-old from Colchester punched the board when the German fought back from 2-0 to draw level at 2-2, drawing blood and stunning the referee and crowd, before holding his nerve to seal a dramatic victory.
"The PDC and Sky TV say to us 'show your emotions'. From 2-0 up that shouldn't have been 2-2," he said.
"Nothing against Andree, he played fantastic. The next two sets, he ripped me - 3-0 3-0. Fair play to him. And I let it get to me. I apologise to everyone that's watching the game but I'm showing my emotion. This is how much this tournament means to me. I shouldn't have done it but I want to be the Ladbrokes.com world champion.
"I'm disappointed at myself for doing that because Andree's a lovely player, a lovely person.
"I think I possibly put him off a bit so I apologise for that."
Scotland's Ronnie Baxter was also successful, defeating Dutchman Roland Scholten.