According to rule 13, Blue must keep clear of Red until she has borne away to a close-hauled course. This does not happen until the final frame. But even after that, Blue must initially give Red room to keep clear as indicated by rule 15. Blue does not do this, for Red is forced to react before the completion of Blue's tack in order not to risk a collision. Blue has needlessly tacked too close to Red and infringed rule 13 and/or rule 15.