Heh, didn't have much to add, 'cept for a nice little incident on Revolution over at SFMM over the weekend. I had just finished pulling down the OTSR and still had my right arm up near the handle as the ride-op came up from behind me to check the OTSR. She went for it, and got blocked by my arm. I instinctively pivoted it downwards, at which point she went for the lap bar, and I blocked her there too. It all went just like some kung-fu movie, block->whip->block.
Obviously not intentional, and she thought it was pretty funny, so no harm, no foul :)
