Good episode its also nice to see Sakura slapped for moronic behavior. Yes I understand she did it because she cares about him and all that but its pretty obvious even touching him is VERY dangerous.
I found it fairly clear what Yamoto did considering he jumps in close puts his hand on the necklace and it clearly activates then he pulls back leaving a connection to the necklace. After that the Kyuubi's chakra is being pulled inward to the necklace and I assume being purified.
Also the fact Naruto ends up pretty much skinned alive after all that takes place is pretty disgusting atleast sakura grows back his skin for him in the preview.