Claire needed to clear her head after the sudden 'bombs' that had been dropped on her lately; Molly being older, Elle saving her, Sylar being here, etc, the list went on. Though LA wasn't exactly safe, she still wanted the cool air.
If Claire hadn't been looking over her shoulder every so often, she would have missed the two girls just off the street. The one was clearly covered in blood and immediately Claire crossed over in a run to see if she could help. "What happened, is she okay??" Her subtle Southern accent broke through in her concern. She stood over Tosh, afraid to touch her until she understood the situation more fully.