AIM 7-3-3 b.
in rare instances a wake encounter could cause inflight structural damage of catastrophic proportions.
===
food for thought, above from the US AIM.
maybe the votex hit the vertical stabilizer of the airbus "just right" to make it come off...and all the rudder pedal movements in the world just wouldn't matter after that.
see you all at the picnic! all the food for thought you can eat!