Absolutely awful driver. Must have had the train in manual. Multiple extremely hard stops at almost every station, much worse than usual. Passengers in my car kept falling down, because she would slam the breaks to a hard stop, and then suddenly lurch the car forward 1 or 2 feet without warning. Saw her open the door to the front compartment to hit a rider who was standing in front of it - she didn't try to exit the cab, just opened the door to hit him and then closed it again. Also kept missing the correct stopping position for a 9-car train and then jerking forward to the stopping position for a 10-car.
Don't know if she was angry or just a really terrible driver.