Didn't see the video, but i think you mean "sweep picking"?

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and with the loss we became strong.

It might just be someone palm muting so they can pick faster. If u listen to The Crowing by Coheed and Cambria, about halfway thru that song theres a big section full of fills like that.
I'm not even sure it's palm muting, I think he's just playing it on the neck pickup using the higher frets; they get that sort of tone a lot.
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