Note that it seems likely to me that any amorphia generation by an Easterner would likely result in a trip by any witness to an oubliette at best. That Vlad wasn't disappeared now strikes me as surprising - perhaps Aliera was able to argue that his soul is a sufficient excuse for the event and either the truth (doubtful) or some reasonable lie (also doubtful) was told to the Left Hand witnesses, probably along with a threat should anyone gossip.