Sutil crashed, introduced out a security car (the usual one). Security car came in, first lap after restart Kubica crashed. The usual security car [probably not] wanted to be refueled, so a course car came out as one more. A lap later it changed into as soon as swapped encourage to the Merc out entrance.
Edit: the refuelling changed into as soon as the hypothesis encourage when it came up, there are extra believable potentialities that can well perchance be drawn after rewatching the footage, please refer your amusement on gasoline tank sizes to the comments under.