Kalistan,
The crew had to deal with erratic responses from both engines, probably not knowing what to expect next ... ?
Also, IF this event is a consequence of fuel contamination (?) any type of aircraft would have probably suffered the same way.
But as you say, let's wait for the complete version of the facts ...
Fuel contamination can be a very critical factor in the everyday operation.
In the following video they show what kind of precaution they take before refueling Air Force One (3:30 in the video)