The presumably rather experienced crew of this aircraft decided to shut down and engine and land as soon as practicably possible.
How do you know "land asap"?
When did the failure happen?
Maybe it happened 2 or 3 hours into the flight. That's just to early to make your destination on 3 (higher fuelflow due lower levels). And in DXB there happens to be another major A380 operator - in case you need spares - and lots of hotels and transfer flights.
My guess: they tried to make LHR and when it started to appear they couldn't make it, went for the best commercial en route (not many accommodate the beast).
So, unfortunate for the pax, but hey, these things happen. Not really a land ASAP event.