It at least confirmed what he had thought earlier about the bloke being vaguely familiar. And it even explained why he wouldn't have completely recognized him.
"By all definitions it was. And for someone's amusement, even," he added looking down at the mattress, feeling distinctively disturbed. He knew of and heard various accounts of the sorts that served the Dark Lord. Something like this shouldn't be something that startled him since it was a reality at some point. But the stories were one thing and a visual was clearly another. He wasn't quite fond of blood to begin with, so the images of people being tortured just didn't sit well.
He took his other hand and placed it on top of Justin's hand. It was oddly comforting to have some sort of physical contact with someone--he felt at least somewhat grounded, at least.