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first 18 seconds should be habara, ezura for the rest?
https://wavemotioncannon.com/2019/10/15/episodic-gurren-lagann-interviews-with-director-hiroyuki-imiashi-co-episode-3-anime-style-january-2008/

"Imaishi: Indeed. He worked on separate parts, all of them being action scenes. Like the moment Enki falls down in part B, or the gigantic explosion after the finishing move in Habara-san’s part."

I take it he's referring to this part since this is the only scene I can think of with a giant explosion after Enki shoots missiles that isn't fully confirmed and is after Habara's part.