perhaps the 76 pilot forgot to turn off the autopilot before departing the seat. It can do wonderful things when wind tilts the disc or tries to yaw the aircraft on the ground.
There are no frictions, just electric trims, to hold the controls steady. If he turned the trims off, the disc can flop around quite a lot, but at least the autopilot can't drive it. My choice would be:
Idle RPM
trims on
autopilot off
park brake on!