“So a Helmsman has nothing. MORE STORY IN HIM OF A HIGHBLOOD THAN HIS OWN GODDAMN SELF,” he says dryly. “Either a LIE or a BORE."

He doesn't think that the Helmsman might've forgotten. Lowblood's don't live long enough for that, he fairly certain. Niether though, does he believe for a second that the Helmsman has nothing.

He snorts, "Well, he apparently met a Grand Highblood and lived. THERE'S A MOTHERFUCKING STORY FOR YOUR SORRY CHUTE." Implied is a very hefty, 'oh c'mon'.