Maybe it wasn't exactly like how Ruby could do it. Ruby didn't nudge. She shoved. Isobel's seemed more harmless somehow, not that she'd ever describe it like that to Ruby since her friend thought she was a monster for being able to do the stuff she did.
Zu nodded. Ruby would be worried. She looked around at the same time a older girl of eighteen or so appeared at the end of the aisle.
Ruby shouted. "Zu!" And then ran towards the girl. She knelt and pulled Zu into a protective hug. "Are you okay?"
Pulling back, she saw Zu nod, then look at Isobel. Ruby followed Zu's gaze and stood up to face her. "Thank you." She assumed by the way Zu looked that the woman had helped her out. It also told Ruby a lot that Zu wasn't afraid of the woman.