How do you cover this?

[Jake80]

Two officials. Team A man to man full court press. Team B inbounds the ball and begins advancing. B1 picks up his dribble at the backcourt free throw line and passes it ahead toward a player who may or may not be in the front court from my view at trail. B2 is not looking and ball hits him in the back and bounces into the backcourt where it is recovered by B3. Is it my call at trail or should lead make the call? I could not see from my position as I was behind the ball position in case of a steal by Team A. Lead was quite far up the court as there were players under Team B's basket. Was I in the wrong position? What is the best way to cover this? By the way we made no call and nobody complained but in the future I would like to be in proper position for the call. Thanks.