Facts: Series race, PHRF. Course = W6 (windward/leeward, 5 mark roundings and finish downwind). Winds 10-12, no waves. The first two boats (Melges 24s), after rounding the 5th mark and turning downwind become confused and instead of finishing they round the leeward mark and continue to the windward mark and then finish. In essence completing a W8. The third boat round the fifth mark finishes the W6 as the course was designed.
Question: How should the two Melges 24s be scored. Did they simply sail extra length and their finish time should be when they crossed the finish line. Or, did they fail to sail the course and are they required to unwind the extra two roundings or take the appropriate penalty?