Christian Horner accused Lando Norris of violating a "gentleman's agreement" which led to a scary moment which almost saw him crash into Max Verstappen at high speed.
It happed during the final part of qualifying for the Japanese Grand Prix, with both drivers on an out lap. Verstappen was ahead of Norris on the track and was going slowly through the final few corners, and the McLaren man decided to overtake to get track position.
As he came past on the inside, Verstappen briefly lost control of the rear of his Red Bull and twitched sideways. That forced Norris onto the grass at speed to avoid a crash, and the stewards have called both drivers to their office to explain themselves.