Even in NCAA, I think that if you are in a defensive stance and the player does a slight bounce back, 3 feet of separation shouldn't give them a free pass. I would consider B1 to be actively guarding. Note I am not saying that B1 ceased to guard, just that A1 created a little bit more space than when driving into B1. And I think in NCAA, if B1 maintains a stance and A1 only backs up 3 feet, and B1 closes down, they would be considered to be actively guarding.
Also, I don't think this is as much an issue in college, because the players move quicker and create more space. They cover more floor space in less time than most HS guards.
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