You can't blame him. Put yourself in his situation. RM won't delay their training schedule just because one player's future is unclear. The negotiation could fall apart anytime knowing how Perez does his transfer drama. If you were him, you'll come to train as well. If he ends up staying no supporters will abuse him and if he ends up leaving, he does it in a way that is respectful towards his old club and still getting the move he wanted. Win win situation. Not every player is a drama queen that throws his toy around if he doesn't get the transfer he wants.