Ariadne had seen posts from people returning from the prison and had headed out in hopes of possibly seeing James and bringing him back. Or Eames, even though he had his own Arthur and her other self to look after him. He was still Eames, after all. And both of the missing men were among her few friends in this place.
But even though the bloodstained figure shuffling his way down the street wasn't someone she recognized, Ariadne still hurried towards him when she spotted him. He didn't appear to be a zombie, even given the state of his clothes, so she was probably relatively safe. "Hey, are you okay?" she asked, when she'd gotten within a reasonable distance and could either move in to help him or run away if he proved dangerous. "Is... is that your blood?" It hadn't sounded like the prison break was that traumatic, but maybe she just hadn't heard those stories yet.