Remember that the Kmax like the Bell 204/5...UH-1B/C/D/H/K/L/M and 214 used for logging all have one engine....61/64/107/234's have two. If one can release the longline and load with a two engined machine....things get pretty nice....not so for the singles.
Imagine sitting there with the collective lever up under your armpit....180 foot longline...max weight on the line....no airspeed...no place nice to land...steep slope....and yer Donk dies.
It is not going to be a pretty sight when it is all over!
Now ol' Nick will argue that the chances of an engine failure are something like...... .000008 or something.....thus pretty rare events....but I would suggest the chance of crashing a single following an engine failure while logging following an engine failure is much closer to 1.0 .