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Highlights:
Once entering the building, Sir Nighteye's forsight has led him to a mechanism that opens up the way down. When the passage opens, three of Overhaul's thugs burst out. Bubblegirl and Centicoil are able to handle these guys and send the others on their way.
Not too far up, there is a wall, and it appears to be a deadend. Mirio checks it out. He confirms that the passage continues beyond the wall. Deku and Red Riot take it down. Suddenly, the hallway is twisting and morphing. This is the work of Mimicry with the help of Overhaul's enhancement drug. Mirio insists on going ahead and passes right through the walls. A short distance up, the floor opens up enough to drop most heros down about one story.
After dropping through the hole, three more of Overhaul's thugs show up; Toya Setsuno is Larceny. He can instantly steal a person's equipment. However, he cannot steal anything that is too large. Soramitsu Tabe a.k.a. Food is always hungry. His teeth and jaws can tear through anything in a flash, and his stomach digests it all before you know it. Yu Hojo is Crystallize. He shaves his head to make it easier to pump out a massive amount of crystals.
Fueled by his best friend's determination, Tamaki Amajiki a.k.a. Suneater, one of U.A.'s Big 3 and working under Fat Gum, decides to single-handedly defeat these three members of the Eight Bullets. He tells the others to go on ahead, and Fat Gum trusts him enough to do so.
Tamaki didn't act quickly enough, and the three gained their quirks back after losing them temporarily thanks to Eraserhead. However, Tamaki realizes that the common octopus has neurotoxins in their saliva. He put that in his tentacles to paralyze Tabe and the other two.
With his quirk and a good deal of intelligence, Tamaki manages to outsmart the trio and take them down. However, the confrontation wasn't easy and left a toll on his body.
NOTE: This episode is covered in volume 16 of the manga.