You may think I have forgotten about the Hogansteins mysterious scandal, but I haven't. This is just a small hint as to why the couple arrived separately to last year's Halloween Ball. Not many guests noticed this, but Boris arrived in another car, that wasn't his own. The car he drove had a dented front passenger door, the left headlight was smashed and the car was a moss coloured green. All these elements made it obvious; this wasn't Boris' car. When he entered the foyer, few people noticed that he also had mud on his shoes, he had tried to scrape most of it off but you could still see the mud smudges.
But why was Barbara ten minutes behind her husband in the couple's car? She was burying the body of course.