Severus wasn't sure what sort of advice he was supposed to offer (aside from keep your hands off it or it's bound to go wrong, whatever it is), but did feel some small amount of curiosity about - perhaps even responsibility for - Goyle's stint in prison. He had never found Goyle to be a stimulating conversationalist, but it was, first and foremost, probably better than babysitting, and might shed some light on why Goyle seemed so concerned with someone who had never been at all involved in their activities. It seemed perfectly natural to him that someone had finally noticed Nott was a little touched in the head, but clearly someone was upset.
"Come in," he said, waving Goyle to the chair across from his desk. The office hadn't changed very much in the past few years. He'd transferred his things up from the dungeon, had added exactly one picture to the clutter of portraits and other frames that hung on the walls, and had acquired a few more interesting and vaguely unsettling specimens in glass bottles. "Sit. I'll tell you now, I don't know anything about what's happened to Nott. If you're looking for information, you'd do better to follow up with the hospital."