First the Blue-ghost will talk to you. Press "x" to make him stop then he will start to launch saws at you, so be prepared. After dodging all the saws you should be able to have a free and clear run to a B-doing. Bounce on it, but ONLY when he stops moving and make sure you land on his glass. After you have hit his glass he should start throwig saws at you again. Dodge these and start again!