Nina reached out and clutched his hand as she nodded, looking down at the rock instead of at him. She couldn't tell him the truth, at least not yet. Orion was such a passionate and strong-willed person, one would assume that he could've been sorted into Gryffindor. She trusted him not to knowingly run around and spread her secrets but she was concerned he'd somehow inadvertently give them all away in one moment of impassioned recklessness.