The viewers really don't know what the person at the potters table is "doing" - especially those not acquainted with this work.
True, but neither did I. To me, it looked like a measurement of the vase, of sorts...
Suppose I knew what was going to happen, set 10fps, and fired. Which frame would I pick then? When the vase was just touched by the thread? That's not that different at all from what you see here. When the the thread just started cutting through? But that that's not what I'd want to capture -- to me, it's the last moment when that nice vase still existed.
Probably, I should have titled the image "Dying seconds", with no explanation, and left it at that...