Bisping's strategy to get a UD wasn't the only thing he could have done, but it was the smartest. Lets face it here. He wasn't going to be able to finish Leben. In the last 10 seconds of round 1, Leben charged at him, head first and hands down, Bisping threw a right hand straight straight to the jaw and a head kick and Leben didn't even budge.
Fighters go in to win. There are many ways to win. But sometimes, you have to give your opponent the benefit of the doubt and go for the decision.