Alex captures Mary (Nikki Hentz) , ties her to the bed. In first frame of the scene, He puts burning charcoal just below her left breast before she dies. Later when all detectives investigates her naked body at the same place, you can see the big burning wound between her two breasts and not on the same place which was shown in the first frame.
After Mary (Nikki Hentz) dies, police men gathers around her naked dead body and discuss about the cause of death. The camera placed on her naked breasts. You can observe her breasts slow movement because of breathe.