It startles her when Laura vanishes and she stands up, extending the bo staff in expectation of an attack. The sound of Laura's voice makes her turn towards it and slip into a defensive stance, until she registers what was said, and how it was said.

"Hi?" It's clearly a question, because Steph isn't sure what to make of this situation or the girl in front of her. She knows not to underestimate someone based on appearance; Cass was tiny and could look non-threatening when she wanted to. But there's no aggression and that's what makes her lower the bo staff.