Stuart is bad at deception

Stablemaster (bernardo) knows he's an Augustyn Locksher knows he's an Augustyn and was told he's a blood drinker Pustness military saw his noble documents

Eardbelm saw him drink blood Orivon saw him drink blood, and told Zdeko Everyone on the goblin raid saw him drink blood; Eardbelm, Eryn, Irindel, Grum, dwarf military Eryn knew about Korinna (not by name) and is assuming Stuart is one of her thralls