In the earlier posts on this thread, many opined that the video seemed to be faster than normal citing the walking pace of the ground crew prior to the collision and the taxiing speed of the AF plane.
I just saw a version of the collision video from AP and it seems to my eye and senses that everything is moving slightly slower.
Looking at this link, the A380 does not appear to be moving quite as fast (I make no judgment whether it is the appropriate speed). I believe the ground crew begin running toward planes after they collide. The sequence with truck crossing in front of the RJ is missing.