"Exactly!" Heiji had apparently forgotten about his annoyance with Snake for the moment. "The usual treatment is to give the patient some topical medication for parasites to win their trust. Then the physician prescribes antipsychotics. Unfortunately, from the patient's perspective, he doesn't need antipsychotics; he needs treatment.

"And the more he insists that there really is something wrong with him and tries to submit proof, the more convinced the doctor becomes that there's something wrong with his mental faculties. So even if there was something genuinely wrong -- neuropathy, maybe -- it's difficult to disprove the original diagnosis." Why he was so happy blabbing on about some horrible disease was anyone's guess, but Heiji seemed to have cheered up at once.