It doesn't need to be lethal if you react correct....
As said, in flight, it shouldn't be that big a problem if you recognise the malfunction (sudden yaw, and no reaction when moving the pedals).
It's more risky to dump the collective and autorotate where you are, than actually fly to a suitable landingsite (airfield etc).
What you SHOULD do in any case is cut the fuel-flow before you cushion the landing, orelse you'll be spinning all over the place on touchdown...