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It seemed pretty obvious that Froome was stuck in a very low gear as his cadence was way higher than anyone else nearby (even accounting for his preference for a high cadence) and he was still struggling to keep up with them.
unless the mechanical is caused by outside influences
Trying to decide, in the middle of a stage, whether something was outside influence or not is going to be an interesting one. Was it a fan that got too close and knocked the rear derailleur? Was it the fault of the team mechanic? Was it a duff battery supplied by Shimano?
Sounds more like he was stuck in gear, rather than dropping a chain. Personally think this "etiquette" is somewhat BS, unless the mechanical is caused by outside influences (Tacks, crowd etc) then to an extent it is yours/ the teams fault so attacking is fair game.