This scene is such bullshit.
Gandalf all of a sudden knows that Sauron's a thing now? What about all of that doubt and intrigue in the Fellowship of the ring? Is gandalf just the chillest cat ever going to birthday parties, drinking at Bree, going a round and Oh yeah, the One Ring is PROBABLY in your best friends hand, but no worries, who cares? SAURONS JUST BACK WHY WOULD THAT