The Formula 1 stewards at the Sakhir Grand Prix had something new to consider: a driver running two of his team-mate's tyres.
This was one of the two results of Mercedes disastrous double-stack pitstop under the race's second safety car, which cost George Russell a likely victory after he'd been sent out with medium tyres from Valtteri Bottas's allocation, and destroyed any hope of Bottas going to win as he had to head out again with the same set of hard tyres put back on his W11.
This is against article 24.2a in F1's sporting rules, which is aimed at stopping, per F1 race director Michael Masi, "if a team's run out of tyres, hypothetically, they could be using a 14th/15th set of tyres (13 sets are set out in the rules), which obviously then gives them a resultant sporting advantage".