What was he thinking?

[frozenrope22]

Here is the play: Runner on first with one out. Ground ball to SS who flips to 2nd covering bag. Runner slides late but slides none the less. 2B is standing on the bag and doesn't drag or move so runner cuts him down. BU gives the out sign and turns to watch first base. Close play at first could go either way. BU umpire indicates closed fist out. First base coach starts to argue and BU is arguing he was out and it wasn't close. After a little back and forth BU says it doesn't matter anyway because runner didn't slide at second. Then the discussion turned to whether he slid or not. As I said both plays were close and neither was a bad call in my opinion and the BU and Coach exchange was very short. I was just making the observation that he shouldn't have left the field via our side and he wasn't going to win any arguments with the parents so don't bother.