Final answer:
A player who exits the field before the referee's whistle following a committed foul and delayed penalty may face additional disciplinary action or penalties for their premature exit, which is typically seen as unsporting or a rule violation.
Step-by-step explanation:
If a player has committed a foul, resulting in a delayed time penalty signaled by the referee, and the player leaves the field of play before the whistle to stop play, they have made a mistake according to standard sports regulations. In many sports, such as soccer or hockey, play should continue until the team of the non-offending player gains possession of the ball or puck, at which point the referee will blow the whistle to stop play and enforce the penalty. A player leaving the field during this time without the referee's permission could lead to further disciplinary action or an additional penalty being assessed against their team, as it can be considered unsporting behavior or a breach of the rules.