NF...The only restriction on leaving the field applies to A or K and even then there is an exception if A or K was blocked OB and he returns at his first opportunity. B can leave and return anytime he wants.
I agree that the penalty should be enforced from the yardline spot of the foul...but if A went out OB to make the hit and then returned (i.e. one foot hit the sideline but his other foot then hit inbounds), then you will have a 15-yard illegal participation penalty rather than 10-yard BIB.
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