Istredd lets Lucifer distract the other kids, it's for the best because they can only get in the way at this point. They're there to protect all of them, but most are doing fine, there's only the doll ones to worry about. Keep going. The ones with the dolls are focused on them and Istredd lets his mind back away from the music and everything else. He clears it and opens the door and touches on all the minds around him.

The ones who are listening to Lucifer he can lock away. The others all have that lullaby although it starts to fade away, some of Lucifer's music coming in. He hears the return but he is more focused on the dolls, until he sees figures in their mind. Standing over the dolls. It's all on the outskirts of their mind so easy to miss if people didn't delve in deeper the way he has. He reaches out mentally, digging into their minds.

Possession, maybe, I think I have an idea. I'm going to need you to sound bad. Screech, make something that would startle them.