Red Bull boss Christian Horner says he doesn't understand why Sergio Perez botched his pitlane start in Qatar's Formula 1 sprint race, allowing Franco Colapinto to overtake him.Perez and his Williams rival, who having both fallen in Friday's SQ1 were due to line up towards the back of the grid, were starting from the pits after their cars had suspension set-up changes under parc ferme ...
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