She notices his disorientation and looks more closely to check his pupils out of habit, in case he has a concussion. "Maybe," she says thoughtfully, gesturing for him to move a little further from the burning train car just in case. "I haven't checked thoroughly, but it looks like everyone here had one of these. It's where I got the mask."

Examining the contents sounds like a good idea, but Cheris wants to do one more quick look into the train car, just in case someone was unconscious and hidden by smoke. If the stranger has a concussion he shouldn't put himself in further danger. On the other hand, she wants to rescue as many people as she can, even with her broken rib.