I think the most important thing is that you look out the window, whilst modulating the collective to maintain Nr. Checking your density altitude and working out he Vne is low on the list of priorities.....
so in your pre-flight planning you have not considered your DA and hadn't thought what your max speed in auto might be - you are pushing forward for range to avoid landing in the shark-infested custard and with the lever fully down, your Nr is decaying and your landing point is sliding gently up the windscreen..........
