Very well said 170".
Shawn.....the "Surprise Factor" applies to Multi-Engined helicopters too especially if in other than Normal Operations that keep you light enough to fly around on one engine.
Load the Bird up doing Vertical Reference work in steep terrain sometimes as 170 mentioned where the only way out is UP.....and sometimes flight path restriction comes in the form of a raging Forest Fire.
All engine failures are not the same....it is one thing for the fire to go out....and another for it to go outside when a Power Turbine Wheel explodes and sends shrapnel all over the place.
Failures certainly are rarely straight out of the Check List or Ops Manual....and that is why it is hard to "train" for every eventuality.
When things go wrong....you do the best you can.
I once handled a Cockpit Hydraulic Fluid fed Fire, Utility Hydraulics Failure, and a loss of a tail rotor control pedal (physically lost the pedal from under my foot) while IMC with a Sling Load in Mountainous terrain.
The Checklist and prior Emergency Procedures Training did not cover that situation with much detail if any.
We did not look at the Checklist or actually conduct a single drill as laid out in the Manuals and SOP's.....but we handled the problems and recovered the aircraft to a safe landing zone.
Past Training helped structure our actions but being able to think our way through what we needed to deal with and set the right priority to it was the key.
That holds to performing an EOL or recovering from a single engine failure in a Twin.....you have to apply the right technique for the conditions you find yourself confronted with. There are some systems failures that demand nearly instantaneous reaction from the Pilot.....and certainly an engine failure on a Single Engine Helicopter is at the top of the list....as if Rotor RPM is lost then nothing good will happen after that.