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It means you've enjoyed the benefits of riding as a pair, ie aero drafting, shared load carrying and morale. I can see why it is frustrating to not be able to convert to the solo category but it's for a good reason. Enter as a pair, finish the race as a pair, that's the challenge you've undertaken to accomplish with your partner.
I think it's certainly within someone's rights to ride the rest of it and join the finishers party but in terms of rankings and leaderboards and coverage of the race, it's game over imo
It's a big change from being paired to being solo. ?