The open spin class and A class were started together but scored separately. The F16 was trying to finish as quickly as possible to obtain the best score in that class. The A cat, in this case was more like a moving obstacle rather than a competitor.
It doesn't matter whether the boats started together, are scored against each other, or are even sailing in the same regatta. If they are both "in or near the racing area and intend to race, are racing, or have been racing", then the rules of Part 2 apply. See the preamble to Part 2.
Regards,
Eric
US Sailing Certified Judge
Member, Area D Appeals Committee
