The weird thing is that what he was trying to do was exactly right. They ask him if he pepper-sprayed her, they ask him for his side of the story, and all he wants to say about it is that he wants to talk to his lawyer before saying anything. You can hear how completely reasonable it sounds coming out of the cop's mouth that he should just explain what happened, but this is a trap. Shut the fuck up completely is the right thing. The way I heard it from one defense attorney was, "The first time the prosecution hears your side of the story is on the stand, in front of the jury. Anything else is just giving them extra tools to use to put you away."
Of course, he accompanied that with being a douchebag to the police for absolutely no reason. He could have done that one thing, without doing the other.