Horacio growled at the show of violence from Vitruvia, what in the throne's name was the madwoman doing? For all he knew she was possessed by daemons after the event; it was certainly how she was behaving. In his opinion what she did warranted an execution and excommunication. Such rude lack of appreciation for the lives of heroes, such careless waste of the Emperor's currency. You shot a coward to show an example, you didn't kill a normal Guardsman for that made them sympathetic to the cause of Chaos; after all, from what they so far witnessed Chaos did not behave so rashly, so evilly. Then again, what if it had, merely under the guise of a stupid Sister? 

He didn't speak for a long time, his plump face reddening and swelling with rage. He listened to what all of the parties suggested, occasionally glancing with fury at the crazed Sister. "I agree that for now we best replace him with another suitable figure; perhaps even our Lord can temporarily fulfill this position but I am sure this would distract him too much from current tasks. However I am also sure that a competent administrator can be quickly arranged for the interim." With that his complexion slowly turned from a tomato to more of a sweaty melon and finally he settled down to be more or less normal in appearance except for a frown and some errant beads of sweat. 

He steepled his fingers on his power maul which he once more used as a staff, and looked to the skies thoughtfully. "I believe an investigation is the best course of action. There wouldn't be a way to conceal our intent at least partially would there? Perhaps under the guise of a search for xeno contraband or something of the sort? I of course could then investigate much easier. Preaching - and subtly obtaining knowledge - would certainly be much easier because the guilty parties would care less about our presence."