In that hypothetical scenario, Rosberg would have been mightly pee'd off. But frankly Hamilton would behave in the exact same way. As much as their fans like to pretend otherwise they're really no better than one another, in that sense.Lewis' mistake was actually listening to the pit garage and taking that extra stop.
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It wasn't the wrong call, necessarily. Hemming a bit and taking those tires a bit later gave him the opportunity at an overtake late in the race. Lewis just couldn't keep it together enough to make an attempt.
But just imagine, if Lewis had managed to keep Nico at bay on that safety restart... how Nico would feel about Lewis ignoring the team calls to pit.