In this photo, look at B1 "defending" A1 on this drive from the perimeter, and envision what you are concentrating on. Is it the start of A1's dribble? The position of A1's hand on the ball? A1's left elbow? B1 having already achieved legal guarding position? B1 sliding to maintain legal guarding position? B1's right hand? Your angle to the players?

Continued...