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Might be misremembering but didn't Wiggins (who was in yellow at the time) slow everyone down for Cadel Evans once because he punctured?
Yes. 2012. There was an attack on the Tour by some nasty idiot throwing tacks on the road. Wiggins was ahead; Evans in the group behind. Wiggins, once he was told on his radio, neutralised the race. A decent and proper thing to do under those circumstances.
Yeah, but then being able to halt proceedings (to some limited extent, in some conditions) by sticking your arm in the air is a pretty significant advantage in the face of those attacks. If a third place rider was being attacked by a four place one, he wouldn't be able to stop it by needing a 'comfort break'...