Is It Food Poisoning?

Righth does say, he does say, before marley shows up yet, that he has a head cold. He didn't stumble up the stair. There ar a few other small things. But it ends with him saying, the spirits stayed away. It's clear that his being spooked earlier, by non spiritual beings, by the actual beings, that plays a role here. And so i think the fear might also have put him in a place to make him more receptive to seeing visions or hearing things.