His just knowingly and quickly shoving that pen/marker down his pants pocket so hard, quick to me meant that he just WANTS THAT bad even for the instant moment it is not taken from him and he can do damage to himself. I think he plans on NOT going to a crummy type prison if found guilty. I think he is seeing that he will be found guilty. It's the WAY he made sure he had that pen and shoved so DEFINATELY down into his pocket, checking to make sure way down and had it. He knows they will find/pat down all that and prob saw for sure, but in an instant before that, I feel he will try to use it on himself now.