I fail to see how this happened. Can't the jet use its brakes? Not like these tugs tow at 100 odd mph.
Not entirely familiar with A380 brakes, but I'm sure they
could be. The other thing to consider is that aircraft brakes are designed to be used in a forward, not reverse direction - apply the brakes heavily and the aircraft will happily tip onto its tail.
I would think during the tow/push the pilots will most likely be focussed on pre/post flight procedures. It's a busy time - they don't normally need to watch out during this time. They will be notified when the truck detaches.
If anything, the opposite applies. At
least one should have been entirely focussed on the push back. In some ways aircrew need to be more aware during the pushback as they are not in direct control, so have to be monitoring what the tug and its driver are doing very carefully indeed.
The only time you apply brakes during towing is when told to do so or you are 100% sure that the towbar has broken. Sat up so high, you cannot see a thing. You would not know if you are going to be too close to the taxi way edge or not. You have to have faith in the tug driver. Also if using a towbarless tug and you apply the brakes you run a very real and very big risk of ripping out the nose gear (seen the result of that and the tug driver had a bad day, the nose came down on to the cab......game over) Don't forget, it is designed for stress in a rear direction.
I tow A320's and sit in the cockpit during towing. You cannot see the tug unless you are approaching at least a 70 degree towing angel. If he stopped and was quiet, the tug could disconnect and drive off, you would never know until it crossed your mind that you had not moved for a while. Now if I can't see anything during the towing of an A320 how much do you all think an A380 crew can see/feel/hear.
Matt