Alan: You and I go back a ways beating on the shorts on the AAPL Board, but this selloff has nothing to do with shorting. It is just the expected selloff after the latest round of BS-hyped pumping of these grossly overvalued shares.
As for the questions about circuit breakers, I am not sure they kick in when the selloff is steady and orderly as opposed to quick rapid movements. This is just a slow steady dump.