"Why would the spirits do this? It serves no point other than making us on edge." But that's discounting that maybe they think it's fun. Maybe they want to watch them all run around seeing things that aren't there, laughing to themselves.

"I thought Robin had some way to control them, why can't she simply make them stop it now?" Granted he's never directly spoken to her, but she caused the attack at the party, she claimed to try and get them to stop the attack against Winters. She must have some way of communicating with them beyond the musical instruments that people have been using since.

"We're each seeing something different then. Something directly relevant to us." There's a hesitation before he continues. "Have you met my brother? The shadow clone that follows him.. that's what I'm seeing. But dozens of them everywhere."