yeah sadly a known simulated failure training issue with the garrett fixed shaft engine at low speed, if you pull that power lever back too quickly and the negative torque sensing system doesnt get it quite right and the blades go negative you have just given yourself a Vmca event. It's not an issue with a real failure since the engine winds down and the blades go course. At high speed pulling flight idle quickly you do get a bit of assymetric yaw but at high speed its not an issue.