Convulsion

On this wintry night the visitor seemed to be stabbing himself in his heart*. I glimpsed and the stranger stood coughing blood and screeching the name: \"Beelzebub!\". Confused I was unable to swiftly exit the room, and by mistake I was absorbed by his penetrating sight. (will be edited) *Mayan ritual to extract the heart of the human who was sacrificed. *room - environment (society) (etc)