ground rules

[Skahtboi]

The way I see it, if you are the umpire on duty at the time, along with both coaches, you set the groundrules. I frequently get their input, especially in high school ball where the field is much more familiar to the home coach than anyone there. But, since you are the person primarily responsible for the safety of the players, as well as the fairness of the contest, you should have the final say.