There are lots of urban myths about standing in front of the mirror and saying special words which brings a demon into the room with you. The story goes that once the demon has arrived in your mirror he will always be there in any reflection of you until you find a way to remove him. I mean I don't necessarily believe it myself but sometimes it's worth paying attention to traditional wisdom even if science disagrees with it. Sometimes science can be proven wrong as I said before so avoid mirrors during this episode. If you are superstitious then you know do what you've got to do. Maybe say a short prayer if that helps or try repeating some words to yourself in order to make yourself feel okay