When can the C make an over and back call?

[Junker]

Good call by you. You had definite knowledge that the ball was off A so they should have not gotten the ball back. Sometimes the C has to take this because if you don't there won't be a stoppage of play to tell the T who the ball was last touched by. My only suggestion is to make sure you fade back with the play so you have a good look at the division line when you make the call. Obviously you won't be able to see over and back from your natural C position.