@August
I know that Monaco were a different case, but what I tried to explain is that FIA when that happends explain that in all the cases Race Director decissions and signals (Lights, cockpit leds, monitors advices, etcc…) are over any marshall indication. That is logical.
But if you prefer to think that that is not the way rules work. You take a look to the rev counter and you can check that Vettel begins to use KERS before the Marshall post, and that is not allowed in yellow flag conditions, FIA explain a few races ago that in yellow flags condition no KERS or DRS is allowed.