Shock and injury takes some people like this, knocking everything out of them. Cheris has seen it often enough in soldiers whose formation instinct wasn't tuned well enough to keep them going regardless of their condition. Part of command, under conditions when commanders were allowed to rescue their injured, was finding ways to invite the sufferers back into a reality where it was possible to receive care.

"Yes, it's an air mask." She speaks calmly and encouragingly, holding his eyes, assessing them for symptoms of concussion. "Put it on and let me know if you're breathing all right. Can I see your arm?"

She hasn't seen any metal-cutters or other rescue equipment as she's made her way through the train, but depending on the technology, a prosthetic might be detachable or capable of being wrenched free if a bar of metal can be found among the train car's crushed furnishings.