Debate on this enforcement.
A, 3/7 at B19. A1 throws a pass, B22 intercepts the pass at B10 and runs it back to the A7 where he is tackled by A44. During runback, A head coach is on the field yelling for dpi. HL had to run around him. After B22 is tackled, he gets up and flips the ball into A44's face and says a few choice words.
My take is... A’s coaches sideline interference of 15 yards will be enforced ½ the distance to the 3.5. B22’s ball flip, UNS, will then be enforced back to the 18.5 where B will have the ball 1st and 10. My reference is 10-1-6-b, which says ARTICLE 6. When a live-ball foul by one team is followed by one or more dead-ball fouls (including live-ball fouls treated as dead-ball fouls) by an opponent or by the same team, the penalties are administered separately and in the order of occurrence (A.R. 10-1-6-I-V).
Others are saying that the sideline interference is always enforced last, even though it occurred 1st, when the ball was live. I have never heard of that, and cannot find anything different in Reddings.