Roberts was the chief appellate expert in the law firm. He was asked by a partner to help out in a moot court case, where he would play Scalia.
He obliged, do you give the finger to a business collegue, when asked for help?
Also a question that I have asked on previous threads, who do you believe more the LA Times and liberal media, or GW Bush?
You don't give him the finger, per se, but you can say no thank you. Especially if you know the case is going to court and the colleague is defending the enemie's position.