Rotating by Hand (controlled), then
Rotating by Momentum (think 'heavy things rotating versus light ones'), then
Rotating by an Engine (no stop, per se... only takes a split second and 'accident', too late).
In the above order,
"GoGoGadget SafetySonar" (commensurate with the RisingRisk of EACH!).
i.e. "Rotating by an Engine" for a ShortCut is just not an option; period.
'Done some dumb things [no EyePro, guards off Saw/Grinder, no use of Vise to keep 'grinded thing' away from my body (scars to prove it), lack of Respirator for more 'n a few cans o' SprayPaint] but never let a Shortcut (aka Hack) with an Engine get me!!!