Coache out of box

[DaveASA/FED]

Coach's team gets a good hit toward left center and as runner is running to 1st coach is standing behind 1st base stratling the baseline, right foot on the playing field left off and he has the big wave to second going on. I think he jsut got exicted but it made me wonder, is there anything to keep him in the box? I looked at coaches interference and he did not violate any parts of that. Where is it in ASA that they have to stay in the box? By the way the coaches boxes were very close to the foul line so he wasn't that far out of them, but just wondering. I was just watching, had i been umpiring I would have given him a warning to stay in the box, but it made me look to find where it states he can't do that!