Fair enough. I didn't watch the video, so I'm relying on the reports of others who did. Your account of the incident is the first I've seen that describes it that way. Everyone else who's commented after watching, has said that Clinton seemed surprised by Obama's sudden departure.
One poster who watched several different videos on YouTube commented that in one, you can see Gibbs rise from his chair after Obama gives him a 'look', and appears puzzled and alarmed at what's happening.
Doesn't sound like they planned it that way to me.
first 30 seconds of the video at the hotair link sets up what is being described as BC taking over. Now, BC may very well have exaggerated his role in this (it got good to him), but it was definitely planned for BC to take the podium, 0 to leave, and BC to take questions.
I suspect 0 expected BC to praise how well 0 was handling things, but when 0 was cornered to return the favor to BC .... he chose THAT moment to boogie on out.