I need some help on this too.
My understanding is that if when B1 still in his vertical plane and A1 manages to get his head and shoulder pass B1's torso in A1's establieshed path, even A1 has to twist his body in a strange way, even A1 has to create some contact, then B1 is responsible for the further contact that pushes A1 out of bound.
Is my understanding correct?
Thanks.
ysong
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