"What mask?" Harry doesn't get why Dillon would wear a mask. It's pretty obvious that he's a big blue glowing guy, not sure what the point of hiding that would be.

Also, 'Doctor Doom' is maybe the stupidest name Harry has ever heard.

But whatever. Talking about people with dumb names isn't half as important or interesting as the rest of the conversation.

"It's called Retroviral Hypodysplasia. And it's fatal."