Before talking about today’s thrilling qualifying session, we’d like to point out that overnight investigation of the two punctures that affected Sebastian Vettel and Fernando Alonso during free practice yesterday resulted in a clear conclusion: Vettel’s puncture was caused by debris – a metal piece of another car – getting stuck between the floor and the wheel, while Alonso’s tyre was also clearly cut by the same piece. The markings on each tyre match up and this was also sustained in the same place: turn 13. Today’s qualifying at Spa threw up the perennial problem of some parts of the track remaining wet while other sections dried up more rapidly. The track was evolving by the second, and the timing of the tyre choices proved to be crucial – bearing in mind that an out lap alone costs more than two minutes at Spa. In the first two sessions, establishing the crossover point from intermediates to slicks was the key, and that is likely to be very useful knowledge for tomorrow as well, with yet more uncertain weather predicted. Tomorrow the drivers will be able to start on whichever tyre compound they choose, which increases the options for strategy still further.