I'm not sure what he's saying either, but after studying the clip you posted a little bit, it looks like they cut out the top layer of the mask in 2 phases for each animation. The first phase looks smaller in circumfrance but in perfect alignment with the second phase. Basically it looks lke it goes from the first (smaller) triangle (or triangleS if you look closely at some parts) then directly to the full size triangle that shows the Naruto characters, and the 2nd triangle it held much longer on the beat than the first triangle. So basically it gives the appearence that it's animated because the first phase/triangle isn't there but for a quick beat and then the second masked triangle shows up. It's only like 2 frames per second to make it appear animated. It can be done in Photoshop by the looks of it. You just need to make sure the timing and the alignment is perfect.
There also appears to be some fading in and out with black and white flashes (layered between the Naruto track and the Masked track of the triangle windows).
As for making the animation look right, you might need to do some math to make sure the 2 phases are in proper proportions, alignment, and equal length and such.
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