"Some sort of powerful drugs," Devia says. She looks at Marlin. "Anyone who has been in a big city like Torander's Bluff has seen this. Some of the really nasty drugs, usually the ones that come from the poppy flower or are enhanced with magic, can cause this sort of effect when someone quits taking the drugs. It's not contagious, so you can grab him if you want, but there's nothing you can do for him."
She looks around, out over the fields. "It's odd, though. This isn't exactly a big city with illicit drugs floating around. I don't see any poppy fields either." She takes a moment and casts a spell. "Hmm. No magic residuals on him either, so it's probably non-magical drugs." She seems confused for a moment. "I wonder..." she looks around the barn. "Let's have a look inside this barn."
Let's go do whatever was the last thing that Morlan thought was a bad idea.