Saw this yesterday, an A380 pilot sent it to me. If there was anything unsecured in the J bar it would've gone flying, quite uncomfortable for pax at the back, pilots generally try to minimize yawing movements as pax tend to get motion sick from it.

Difficult conditions, I have two theories: Either the pilot flying applied too much left rudder to straighten out during the flare (+ possibly a little too early, when the main gear wasn't carrying enough weight to maintain the centreline) or the wind was gusting and there was a negative wind shear (sudden reduction in wind speed) causing the aircraft to drift right just as it was also being straightened out, and the pilot then had to apply further rudder to get back to the centreline.

One can see the deflection of the rudder in the flare, I love seeing crosswind landing videos of A380s and 777s, the yawing movement is so majestic and one can usually clearly see the rudder movement as well.