fuel emergency Cat 3 weather
Not saying this is what happened in this case but imagine.... you arrive at destination which is unexpectedly cat 3 weather and you are told 50 mins holding. You have fuel for 20 mins. So you divert to your alternate. Your alternate is cat 1 with one runway and on the approach the runway is blocked by the aircraft ahead. ATC tell you to go around and expect 1 hours delay.
Say there are no other airfields. Where do you go? Back to the destination and declare an emergency? If you still have the fuel, otherwise you might be stuffed already but... you get back there and the ILS is downgraded but the weather is still cat 3. F***!
But whatever the reason for having very little fuel, what choice do you have if you don't have enough to go somewhere else?