First time Quintana has looked like he might challenge Froome, but surely it's too late.
Unless Quintana is feeling amazing (in which case he surely would've gone sooner) or Froome cracks a bit, it won't make a difference.
I guess if he can get the gap under two minutes there will be some excitement tomorrow, though he'd still most likely fall short, but right now it seems he'll struggle to get more than 30 seconds. So he'll still be about 2'30" behind.
In the end Quintana was right in saying he'd be the best in the final few days, it's just by such a slim margin it won't make up for the rest of the Tour. And that's without a true ITT.