Sindri's response is to effortlessly force him to his knees using only his mind, take the Maledictum, and calmly walk away while remarking that Angelos and the Blood Ravens have arrived, and he must now kill them all, with the strong implication that Isador has only then realised what a horrible thing he's just done. In typical Chaos fashion, he claims that he could simply betray Sindri and keep the Maledictum for himself.
How fortunate for the Imperium that such keen-eyed eagles stand vigil over her gates. Gabriel: So the good Inquisitor senses no Chaos on Tartarus.
