He has two heads; how does he do it?

That is certainly unique. I did notice that up until the time when he grabs hold of the 2nd one and holds it away from his body that his right arm never changes it's general position of holding on to the staff. So it's obviously a fake right arm. The part that has me stumped is where in the heck that fake one disappears to once he's obviously using a real right arm.
 
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