BACK BACK 
There was no need to run—races as well as any form of communication through cellphones weren't operating. Many students already accepted the fact they wasted their careers just to survive during the societal collapse. There was seemingly no purpose to live. No races, no achievements to be won. Every uma was stuck trying to make their own meaning of the world around them.
Until the first reports of a strange infection surfaced, causing infected Umamusume to become 'like walking corpses'.
Chaos ensued, further fueled by Umamusume already questioning survival and life itself. Every uma all has different objectives to make it through the infection;
To stay sane? To pray it all away? To protect others? Who knows. Every Uma's dreams were crushed long before the infection anyway.