[Imp]

I cant see the need for crew survival, sure helos can autorotate & land safely if they have the altitude & terrain its like gliding a plane down thats lost power. Can be done a hurricane glided 3/4 the way across the English Channel & made it because he didnt want to take his chances landing in France.

Autoglide landing is probably not so simple if as is likely its not just the engine thats damaged which is probably why the likes of the Apache are built to survive a fairy high impact landing.

But what happens if you get it down in a hot zone my guess.

1) The enemy sees you go down & shoots or captures you before you can distance yourself from the crash.
2) You get out & hide, so zero effect on the battle, pilots are valuable commodities.
3) Much like a car crash you survive but are wounded, incapacitated & or trapped in the wreck.

Ejecting would be the same 3 would just be a bad landing.

If you want to think of a helo that retreats due to damage as one that managed to autorotate and land safely behind friendly lines.
Damaged planes that survive who knows if they made it back to base could have ejected just off map.