I may be totally off with this, but let me take a stab.
B4 grasped the ring to prevent injury. He is not penalized for grasping the ring. It was B4's choice to grasp the ring, he could have come down on A and drawn the foul. There can not be a violation on A unless contact is made in that situation. This is similar to someone seting a screen, it is not a foul unless contact occurs and even with some contact it still may not be a foul.
If B4 was to come down on A then you could have a foul on A, but not before contact occurs.
I may have left something out.
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