Player on court during time out

[Nevadaref]

The problem that I have with some of the responses is that one cannot instruct someone to not do something which they've already done. You can't unshoot the practice FTs. That player has now gained an unfair advantage specifically prohibited by the rules. Therefore, I am of the strong opinion that this now must be penalized. That is what restores the balance for the opposing team.

Perhaps a better parallel for this situation is when a team spills water on the court during a time-out. The officials can't just tell them to clean it up. The rule has been infringed. Not only does the court need to be cleaned up, but the team needs to be issued a delay warning or a technical foul if previously warned.

Another analogous situation seems to be changing a jersey inside the visual confines of the gym. Once the team member removes his shirt he has earned the T. You can't tell him to put it back on or to go outside and finish changing. It's too late. The act has been committed and the penalty is warranted.