13 sec seems like a long time if the guy in a typical command seat is able to reach the throttles and put a foot on a brake. I suppose that they might have been playing musical chairs at the time, I ve even seen this happen in flight by pure accident with both pilots standing up at the same time and running into each other. I'm still puzzled why any such abnormal situation couldn't be corrected in a reasonable amount of time.
My guess is that the bird was experiencing a bit of clear air turbulence and the real movement was not recognized.