The biggest problem when the blades are slowing and you raise the collective is the ability to cut your own tail off. The blades can flap when there is insufficient momentum to keep them horizontal, the lift created will wash off and the blade flaps down. Snap.
If you are at full flight RPM, just touched down and GR starts, you can get into the air to break contact and stop the GR, but only if you have not slid the fuel flow lever back. Once the FFC has been retarded, then do as John as posted.
It is the same in H269, or an AS350.