Canada 2011, lap 69 out of 70, Force India crashes in turn 8/9 (the third chicane).
Vettel and then Button are seen to sail through the yellows, and at the
end of the lap Button goes purple (fastest lap)
My question is whether might have been flagged by the stewards or even penalized.. As DC keeps commenting on the BBC, drivers must be
seen to visibly slow under yellows. So how can button go purple ?