"Men who become monsters? Of course." He returns to drumming his fingers thoughtfully. "But it's usually metaphorical."

Of course, when the soul is displaced from the body, something else can take hold. This sounds very much like that: gnashing teeth and tentacles and black ichor, all the staples of horror beyond even his control. If transformations of that sort are common here...

"I'll keep an eye out," he concludes, and looks back to his new friend. "Thank you."