hmm, i've no A380 in my license, so i can't contribute with facts, sorry. There are some possibility's i think of, why the F/CTL-system act in this way, but that are just speculations of mine.
At least on the A330/A340 there is a function which supports the rudder during "low speed" situations and high "rudder demand" by splitting the ailerons and deploying Spoiler No6.
I'm waiting for the experts
