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Great find, Brian. The arm deflection is something that most beginning students do during tai-sabaki to help cover up poor timing or movement. It's amazing that the same movement or concept needs to be trained out of an individual and then retrained back into them. I guess doing it with a purpose as opposed to a panic driven deflection makes all the difference.
...Is this really taught as 'advanced' in aikido? After all, to me, being able to deflect an attack seems to be the most important basic skill...