No time or distance is required for guarding a moving opponent with the ball, however the defender must get two feet on the floor and be facing the opponent prior to contact.
Therefore, I would deem this to be illegal by the defender and penalize with a block.
PS in my earlier post I was envisioning a stationary dribbler who had the ball get knocked away and then the contact was due to A1 running into B1 while going for the loose ball. That's a foul by A1 or incidental contact.
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