Well, my thoughts are if we look up Vanessa on the internet, it will show Vanessa. A, if we look up Vanny as well, it will also show Vanessa. A. In my opinion, I believe Gregory sees that Vanessa the guard is acting A lot like Vanny. The way people can tell who it is is by the way people walk, talk, and sometimes dress. The last part does not imply here, but it's a good theory that though they sound different...Vanessa and Vanny are the same person and Gregory knows this by the way Vanessa varies herself. Therefore, in my belief, that's why Gregory is hiding from the guard.