Suddenly the permutations of Pool A in which Scotland need to claim four more match points than Japan do not seem half as complicated as ascertaining whether World Rugby would be in breach of its own regulations by cancelling the game.
A precedent has already been set by the governing body's decision to cancel the England v France and Italy v New Zealand fixtures. However unlikely it may seem, Italy could have qualified with a bonus-point victory against the All Blacks. There is clearly far more on the line between Scotland and Japan, but World Rugby has insisted that it cannot apply special treatment and must abide by tournament rules that state pool games that cannot be fulfilled on specified dates should be declared draws.
Privately, Scottish officials are furious and dispute this interpretation of World Rugby's own rules, believing cancellation would damage the integrity of the tournament. As far as they are concerned, World Cup organisers have the power to overlook the regulations in order for matches to be fulfilled. They also point to provisions for a force majeure in the tournament participation agreement which includes a "storm or tempest", a description Typhoon Hagibis certainly fits. World Rugby will make a final decision on the match six hours before the 11.45pm kick-off, by which time it is hoped Hagibis would have departed. What state Tokyo is left in is another matter.
Nevertheless, Townsend remains confident the fixture can go ahead, even if it is played behind closed doors.
"I would hope that everyone who is involved in the tournament would want the game to be played and that they will do all they can to ensure that it is," Townsend said. "I have looked at the weather and Sunday night looks to be quite calm.
"What might happen is that the infrastructure might not be in place, although the weather is nice.''