Possessive

Rick couldn’t see Timmy properly anymore, his back was towards him, but he could see Tracey and he had never seen her look like this before. It frightened him. There was fear there, her whole body was cloaked in it. It possessed her.
But it wasn’t just the fear. Her lips were curled back over her teeth, which ground together noisily as her jaw worked from side to side. Her eyes bulged, veins contoured out of her skull and her knuckles protruded white around the carving knife. Then she growled menacingly at her little boy.
She was possessed by hate.