Theo winced as Snape started to speak, and although the mere suggestion that he wasn't about to be punished was one he didn't believe, being told that he'd done nothing wrong derailed him spectacularly; even if that had been true his father had always found something to punish him with when he was in the mood.
Of course, he still wasn't comfortable with Snape but he looked less likely to bolt into a wall.
He glanced over at Draco a little as though reassuring himself that he too was okay and in no danger when Greg's arm around him had him calming down, turing to give Greg's words all of his scant attention, even if there wasn't enough sense there to make sense of what he was being told.
That fear came back to him, shading his face chalk-white at hearing he was going to be 'examined' but he tried to trust what he knew, that Greg wouldn't willingly or purposefully let him be hurt, and took a seat on the couch Greg led him to, tucking himself in under Greg's arm and watching the other two former Slytherins with the distrusting wariness of some feral thing.