[Jim S]

Your response was OK, with one addition. "He was ALSO told to leave, coach." That puts them both on the same footing, and reinforces the fact that he has to go.

As far as a player carrying water, I wouldn't worry about it too much. First off this kid is probably on the 19th team, and this is as much field time as he's going to get all year. Hey, he may get double credit as a team manager and thereby earn his letter.