Contrary to the opinion expressed by Mr Thumbs Down, it's not a good idea to lower the collective as you're sliding along the ground at the bottom of an auto.
Keep the collective where it was when you finished cushioning on until the aircraft stops moving, then lower it, otherwise you'll probably have the blade flapping all over the place and cause damage to various bits of the airframe.
The thing about the blades stalling out and dropping is a crock!