Rule 9.02(a) Any umpire's decision which involves judgment, such as, but not limited to, whether a batted ball is fair or foul, whether a pitch is a strike or a ball, or whether a runner is safe or out, is final. No player, manager, coach or substitute shall object to any such judgment decisions. Rule 9.02(a) Comment: Players leaving their position in the field or on base, or managers or coaches leaving the bench or coaches box, to argue on BALLS AND STRIKES will not be permitted. They should be warned if they start for the plate to protest the call. If they continue, they will be ejected from the game. [this is itallicized in the rules] and Rule 9.01 (d) Each umpire has authority to disqualify any player, coach, manager or substitute for objecting to decisions or for unsportsmanlike conduct or language, and to eject such disqualified person from the playing field. If an umpire disqualifies a player while a play is in progress, the disqualification shall not take effect until no further action is possible in that play. So if a player doesn't go directly from the box to the dugout, he is in violation of the first rule. "Unsportsmanlike conduct or language" is also an ejectable offense and it is hard to think that Prince did not say some "unsportsmanlike" words. Sure, an umpire takes some naughty words from players without ejecting them, but the rule says each umpire has the authority not that he has to eject them. It was probably a case of both teams yelling at the umps for the entire series and Prince's comment made him finally snap to envoke this rule. It sucks that it was Prince and not a lesser player or an Astro but that is the chance you take every time you talk to an ump like that.