Cool shockwave can anyone explain the airwaves pulsing?

There was no other info on this except fire in the hole.
Original here for 1080p, I don't know how do download 1080p without purchasing some kind of software.
Watching it slowed .25 looks really cool too

https://www.youtube.com/watch?time_continue=5&;v=gb9WtVXLnw4&feature=emb_logo

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