He'd been vaguely worried about the apparent change in Ser Perth, who'd turned from a serious and helpful doctor into a supercilious, high-handed fop.
Ser Perth was coming down with an illness that was causing insanity.
mnli hypothesis: Ser Perth was coming down with an illness that was causing insanity. premise: He'd been vaguely worried about the apparent change in Ser Perth, who'd turned from a serious and helpful doctor into a supercilious, high-handed fop.