Landing with only around 20 minutes fuel in the tanks might well not be the fault of the crew. We can all imagine tough scenarios where this might happen. It is in the back of our minds whenever we are forced to fly with minimum fuels for the trip, when weather is poor or when our fuel state is not quite following the plan. And we've all seen Die Hard 2.
However there is no mention here of an emergency call. To land with less than 30 minutes' holding fuel on board without making a Mayday call is the fault of the crew.