Later - after the war was over and everything else was over too - Remus would wonder whether things might have gone differently if he and Sirius had left school then. Perhaps they could have kept each other closer, or by re- moving themselves they could have kept other people safer.
Anyway. It didn't happen, and it did no good to dwell on.
For years and years afterwards, once the agony of all those funerals and obi- tuaries and memorials and speeches had faded, Remus would be left with memories of his last months at Hog- warts.