Mac,
For a single engined aircraft such as a Hiller, a slight aft cyclic input whilst initially maintaining the collective position would allow flare effect to climb the aircraft a little, then once it was safe to raise the nose more (tail clearance being paramount) the flare could be increased whilst lowering the lever to enter autorotation.
Full autorotation might not be achievable from such a low height, depending on aircraft type and pilot reaction (probably in the speed/height avoid curve at 15 feet).
For a twin (you said no.1 engine, so I think that's what you meant) the correct response would be similar but once clear of the ground it might be possible to fly away or make a controlled landing, again subject to the above paragraph.