[@BCTheEntity] What are you talking about? Vespin was trained on Cadia. They literally fight chaos daemons on a daily basis there. He knows what chaos is, he's seen and fought chaos cultist, and he knows who the traitor legion are. The Imperium might like to put up the charade that it's in control, but knowledge of their enemies is well and widely known throughout the majority of Guard forces. After all, denying the existence of the Alpha Legion is what brought on the the Night of a Thousand Rebellions.

They may not hand out pamphlets discussing the fine details of their enemies, but Astra Militarum soldiers know how to spot a cultist. Besides, it was more of an insult than actual accusation. Xeph's recent 'additions' have got Vespin thinking of chaos.