Theo flinched when Greg's hand came down on his head, expecting the next feeling to be pain but surprised when it wasn't - it was Greg, wasn't it, it was just Greg and Greg was petting him down from his panic in a way that no one else had ever been able to do.
He slumped against Greg's leg and rested his chin on Greg's shoulder, eyes closed like this hurt him. He picked up on the sigh though, picked up on it and stored it away to be looked at and wondered over later, even as thoughts of stones sinking into the lake tumbled through his head.
It made him twitch uncomfortably as Zach used his full name, but it was nothing compared to hearing 'Snape' (although the name had been used before) - something about what Zach said triggered something in him and Theo clutched tight to Greg's leg, face pressed hard into his lap. "He knows." he said, a strained sound like a sob in his voice. "He knows, he knows, he knows where the keys are, but he never lets me go, he never lets me go."