[just another ref]

Originally Posted by Snaqwells

So then can you explain to the rest of the class what exactly is binding in the case play?

I don't see that the case play is binding at all. I see it as one possible outcome on a double whistle.

You said it:

3. "calls" means both officials refuse to back down.

Signaling a foul, in and of itself means nothing. The important part is what gets reported. In the case play, like any double whistle, this would involve some communication between the two officials. Often this is nothing more than one official walking away from the call, yielding it to the other for whatever reason.