Nap of the Earth actually.
So you could convert the horizontal inertia into height by hauling back on the cyclic, keeping the collective up to counteract the Nr overspeed, then managing the speed and Nr as required to autorotate. This may give you enough height to do a turn or try to make a better area for landing.
You could also just do a nice long flare and accept where you are going. Manage the Nr accordingly.
Yes, they do train for this eventuality. Good fun too !!
Watch out for the high speed / low altitude section of the HV diagram, they are probably in it most of the time in this scenario.