An assumption is made in the original post that the PU saw what really happened. No one will ever know that is sure.

So, working on the assumption the PU saw it right and the BU called it wrong, and knowing:
» the defense had no complaints nor wanted to discuss the call (obviously)
» the offense had no complaints nor wanted to discuss the call
» the BU whose call I believe it was, never came to the PU for assistance

then:

Perhaps their karma for that moment was for them to unfairly lose the game.
Perhaps their karma will be better next time.