Hargreeves
Ben knew. He didn't need to be told one way or the other what Klaus had seen because he knew his brother well enough to know that things were not okay. And it was only because he knew Klaus so well that he didn't bring up the fact that Klaus' power set included speaking with the dead, and in this instance it might be helpful for finding the way out. He knew that it wasn't something he'd ever really come to terms with - that the only dead thing that Klaus had ever felt comfortable talking to was here right now, their hands firmly clasped together.
"They can't do anything," Ben murmured, voice low and tight and if he was honest he wasn't even sure that was true or not. Ghosts were weird, and Ben wasn't sure they all played by the same rules -- especially if there was something around that could channel them, like Klaus had him. Given the right moment and opportunity, Ben had had a pretty mean right hook and played a pretty decent game of patty cake.
He was so lost in thought he almost didn't hear the music at first -- just let himself be lead by the hand down the hall until they were there. In front of the door all bright red and eye catching, like it wanted to be welcoming. There was definitely something behind it, piano. Familiarity. Ben thought a little nonsensically about the week that they were children, how they'd decided they were better off without anyone. "I don't-- know."