Pugilistic Animus
Again, I don't know exactly which load case is most critical for the joint in question, but lateral loads caused by the quick initial large movement of the rudder to compensate for assymetric thrust are one of the significant loads. I do know that in the past there was a fitting cracking issue on the 747 at the joint of the aft fuselage to the center wing section where the engine out case was the critical load case.