People get into trouble when they attempt a landing with no escape route and they have not predetermined the power required
In fairness, it was nothing to do with the power available from the helicopter, these two got into trouble because the brain power required to think 2 stages past the next logical step simply wasn't there. To misquote the old adage, you'll always have enough bright ideas to get you to the Board of Inquiry, fortunately in this case, not posthumously.