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That's different, it's taking a wheel from a rival competitor. Martin took a wheel from a team car.
And, as @dubtap says, if the commissaires and/or press didn't see it, it didn't happen.
(On a serious note, usually there are two cars per team in the convoy, but for the Paris stage that is restricted to one, so presumably there is some kind of dispensation which allows other teams to support riders when there sole team car is occupied elsewhere).
@Fox @T-V
@Jimmy_Fingers
erm... good sports, but I thought it wasn't allowed?