Senior Little League Game.... Umpiring by myself Runners on first and second... Batter hit sharp ground ball to F5 who bobbles the ball too late to make a play at second or third he starts his motion to throw to first but realizes he's too late for that as well so he holds the ball. HTHC who was third base coach comes to me states that he has interference at third his runner had to step around the third baseman to get to the bag... I did not see that how ever I was also looking at the shortstop to see where he was going with the play. There was no chance for a play at third base, I doubt I would have awarded him a base anyway. I advised the HTHC there was not going to be an interference call. He wanted to get sideways about it but quickly settled down but was obviously aggravated. Any advice on another way to handle that situation?