Because the proper course includes a gybe, Blue must not sail further away from the mark than needed to sail her poper course until she gybes (see rule 18.4). Because Blue does not gybe, she infringes rule 18.4 and will be penalized. Rule 11 also applies and Red must keep clear of the leeward boat - even one sailing a course not allowed under the rules. The course sailed by Blue does not compel Red to break rule 11, and rule 64.1(a) is therefore not applicable. Thus, both boats will be penalized.