How to correct?

[BigGref]

It depends!

I remember seeing a casebook situation similar to this. If almost all of the players are going for the rebound I think it says you should just "play on" after you realize your mistake. If only the one person relized your mistake, you should probably just go with the old AP arrow, after you find out how much time should be put back.

This is the only fair thing I can think of, anyone else?