Christian Horner was left livid following a decision by the FIA to delay the red flag for Lance Stroll’s crash during qualifying for the Sao Paulo Grand Prix. The Aston Martin driver crashed at Curva do Sol during the closing moments of Q2 and was forced to retire from the session, due to extensive damage to the rear of his car. Race Control waited over 30 seconds before throwing a red flag to neutralise the session, with both Charles Leclerc and Liam Lawson improving on their lap times. Max Verstappen was in the middle sector and improving when the red flag came out, and with just over a minu…