Sky kind of did the same when Valverde was in red in 2012 though.
It was doubly stupid then because they'd whined so heavily about Movistar not waiting for Leipheimer (who wasn't leading the race) when he crashed when Movistar pushed the pace on a descent in Paris-Nice that year. We know Froome is willing to cheat because of the Giro expulsion in 2010 and the illegal feed in 2013, so what's the surprise when he does something not outside the rules but outside the "code"?
There is now a fairly long-standing list of all of the major teams playing foul, and Sky for all their moral pontificating that they did back then are no better than any of them when it comes to being unscrupulous with the "unspoken codes". And they've got into more than their fair share of controversies including Wheelgate, the feeds mentioned above, the 2012 Vuelta and so on, though how much of that is due to them playing unfair and how much is due to their prominent position is something that probably varies depending on your opinion.