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Urgot may be big, bad, ugly and strong but he may not expect what was coming as a result of being 'outed' about her secret.
While he was busy with the fight with Garen, and after Mai had gotten away from Kayle, she'd sneak into his chambers quietly with a bag full of tricks slung over her shoulder. She'd bide her time, and jump the Summoner that often appeared to deliver .. whatever they delivered. The Summoner would be tied up, and strung up to hang center of the room reeking of feces and an assortment of other vile fluids extracted from various fish, or amphibians along the way.
This was her revenge.
His chamber would be wrecked. Even the Summoner was beat up. Everything was destroyed as much as she could do it, and what she could walk away with, she did. Little thief, this one. Items sold off to various markets, trashed off cliffs, or just stashed somewhere for later use. Had the Summoner seen her? No. His chamber was filled with deep shadow, which gave her an advantage. Otherwise, she likely wouldn't have accomplished what she had.
Mai was there, and gone by the time Urgot would returned.