By Daniel Moxon Christian Horner has snapped back at Toto Wolff and Zak Brown after they claimed Red Bull staff have been applying for jobs with other teams. Not all is well behind the scenes at Red Bull. And there are fears that the impending departure of legendary car designer Adrian Newey could spark a staff exodus in the coming months. McLaren chief executive Brown fuelled those rumours in the Miami Grand Prix paddock. He suggested Newey will “probably be the first domino to fall” and claimed Red Bull staff had been expressing interest in a move to his team. The American said: “My guess is…