In reply to Gone for good:
I'm not sure, I reckon Froome is pretty happy. Van Garderen was very impressive yes, but we have no idea how far in the red he was going at the end - getting the leaders jersey at this point is bigger achievement for him than for Froome. I'm reasonably sure Froome stuck exactly to his prescribed power levels in order to stay fresh for the next couple of days.
I was more disappointed with Nibali - I know he has a history of liking to hold back in the Dauphiné, but it rather insults the race if he treats it so obviously as a glorified training session.
I'm pleased for Van Garderen though, he deserves a good result and seems like a good egg. Hopefully he can keep the jersey til the end.