Not having ever flown this aircraft type, and it being the terminal phase, might the owner/pilot perhaps have secured two engines during holding (or in the descent into the terminal phase) to save those last few drops of gas since he must have known fuel was getting tight? (No idea how this aircraft does with just two engines, asking out of sheer ignorance). None of the foregoing condones improper fuel planning/reserve requirements ... I am sort of wondering how they got away with this kind of marginal fuel issue on previous flights for the same route?
What informs the question is some ancient "as a last resort" ideas to "single up" a dual engine helicopter at sea when in a fuel emergency ...