WENDY "Hon?"

Just like Jack (in the apartment moments ago and at the bar with Lloyd), Danny looks at us in the audience. As will be DEMONSTRATED LATER, the 'redrum' message is from Danny - not Tony. It's Danny who's passed through the mirror in room 237, so it's Danny that speaks (and writes 'redrum', and holds a knife) backwards. It's Danny staring at us right now, but when he turns and speaks to Wendy in the next frame it will be Tony speaking ("Danny's not here..."). Danny seems to 'possess' Tony.