Hey Aviation Expert-
Find an audience that cares.
Go to the ntsb 3407 animation clock 22:16:34.
Comment about the roll axis effectiveness of the rudder at high AOA as the video plays from that point.
Pause the playback at 22:16:47 and ask for a sign of hands from the audience as to how many believe that the q400 can successfully recover from the split S.
Push play, have fun...