Wilhelm neutralizing explosions by "just cutting it" is hype of course, but this whole chapter is BRIMMING with skillslop. Also I'm not gonna talk about it, but I'm happy Ferris was mentioned and I really hope he'll be active this arc.
Wilhelm seeing through Yae's shinobi concealment easily, and fighting off ten threads at once. Apparantly if Yae hadn't moved backwards in sync with Wilhelm's kick, the kick would have torn a hole in her stomach. The two of them fighting with objects & the environment makes for a great setting, a confined indoor space makes the battle intense.
Yae breaking the floor to escape death with a lesser wound while baiting Wilhelm into her web, as Wilhelm decides fighting her in her element is better than letting a shinobi of her calibre escape and become 10x as troublesome.
Yae focusing her bloodflow to her eyes, granting colour-blind night-vision as that's something necessary for shinobi, then revealing she can manipulate 20 steel threads using all 20 digits. What kind of insane body control do shinobi have where her little toes have that dexterity? This goes way beyond Olbart saying "moving your eyes independently is the bare minimum for shinobi."
Wilhelm fights off a verifiable spider-web of nigh-invisible steel threads in pitch-blackness, kicking off of walls above a massive hole full of Yae's threads. Yae can basically fly and attack from every direction, while Wilhelm can only block so many attacks, and his ranged attack is avoided and sacrifices his sword (though he just jumps off the wall to reach it embedded in the opposite wall).
Yae ultimately flees upwards out of the hole, while attacking with all 20 threads, and activates her trump card to ignite fire along the threads, creating a bunch of explosions in the hole at the same time as the thread attacks. Wilhelm jumps out without injury, and slashes open Yae (though the full force of the swordflash doesn't hit her).
Wilhelm reveals that over the course of the fight, he came to understand the nature of the steel threads. Yae csn stand on the threads fine despite them cutting flesh easily, so by finding the right taughtness and the right angle, Wilhelm climbed up by travelling along the threads. The explosions of fire were simply cut by him.
We get a great line where Yae realizes Heinkel was right, Wilhelm was a terrifying monster, his skill shown here was greater than what she knew from investigating the battles with the White Whale, Archbishop, of Sloth, and the events of the Watergate City. Narration reveals that, unknown to Yae, Wilhelm had approached the pinaccle of his active career, when he defeated the Sword Saint in single combat.
