I remember Dave Lowry once writing that he has never trained with a Menkyo or high level teacher who did not make at least one error during training. I would agree with that assessment.
Here is the old man himself falling down
Of course it doesn't mean anything, but someone brought it up on my forum. Mentioning that they hadn't seen it before. I hadn't seen it before either.
Sure you have; it was just hidden in plain sight