You are still missing the point. B can go out of bounds and return legally anytime before a change of team possession. Rule 9-6-1 specifically refers to A & K.
The penalty for IP would be against A if he steps on the sidelines while making the illegal block and then his next step is in-bounds. This would be a multiple foul against A and I'm sure B would take the 15-yard IP rather than the 10-yard BIB.
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