If an evolving zone is broken on one day (day 1), make it a weak zone for the next day (day 2) and give it one chance to redeem its strong status. If it's still broken on this next day (day 2), remove it entirely. If it gets no volume one this next day (day 2), do nothing.
If an evolving zone is broken on one day (day 1), make it a weak zone for the next day (day 2) and give it one chance to redeem its strong status. If it's still broken on this next day (day 2), remove it entirely. If it gets no volume one this next day (day 2), do nothing.