No, UI Omen is not from the Kefla fight. He's from the first time he goes Ultra Instinct against Jiren. The pose is the exact same. Dragon Ball Super Episode 110 :
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Ultra Instinct Goku New Form vs Jiren - Dragon Ball Super Episode 110 HD - Dailymotion Video
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Dragon Ball Super – Syrup With A Side Of Writing
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Episodes 109-110 - Dragon Ball Super - Anime News Network
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Dragon Ball Super|Episode 110|Anime
Nerds4Life on Twitter: "Our first glimpse of the Universe 6 Namekians in episode 110 of Dragon Ball Super #DragonBallSuper #DragonBallSuper109 #DragonBallSuper110 https://t.co/lyGbkeDF26" / Twitter
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Dragon Ball Super Dub Episode 110 Recap With Spoilers
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