I was thinking through all the different scenarios, and I think this might be a possibility.
If he is facing a mutiny, someone might be about to go public. Perhaps the whistleblower already talking to Congress, and it's about to explode.
This may be an attempt to keep a lid on it until after the election.
I see it as Comey reading the tea leaves and seeing that he has to go with the honorable mutineers pounding on his door, or the sinking Clinton Cartel, and go to prison himself like John Mitchell.
It’s nut-cutting time.
I’m guessing the FBI is leaking all over the place, all the wikileaks etc. They know what the “next week” news is going to be. Comey must also know. He has to jump back with the honorable mutineers or risk prison.
His actions tell me he is very concerned that Hillary is going down hard, and “the investigation will be investigated.”