John straightens and as he does, it seems like the whole of him follows suit, stretches just barely taller. Like he's... maybe not as solid as he looks, perhaps. Less rigid in his structure. But he is attentive, left hand briefly held out in front of him as if caught halfway through another gesture.

"That could be." And if they're impacted by living people... Well, there's a few things life tends to bring with it. He seems to withdraw? Sink? Lose the height he's gained, then, as he pulls his hand back to his "mouth". "Light, or maybe the thunder, also seems to have an effect. I haven't been able to tell which, but if voices make a difference or any source of light..." It's less confident than his thoughts on the ghosts or impressions, whichever they are, but it's now rattling around in his head.