I think BRD overstates and misinterprets the case 3.2.2A. If the rule makers wanted to make assistance to only be a penalty during live ball, why would they not just say that instead of 'during playing action'? The case allows a coach to pick up a tripped runner, which would be preventing the defense in live ball but really isn't impacting the play during a dead ball award. However, preventing a missed base with physical assistance IS impacting the pattern of play and preventing the defense from an appeal. BRD is certainly persuasive, but not authoritative, it's not the rule book. And in this case, barring some direction from NFHS otherwise, I think BRD is wrong.