[Katsuki expected the Nomu to show up eventually, so when they did he was quick to tell Boothill of their weakness and to start fighting. Blowing up as many heads as possible, if not just whole bodies. The whole time he kept thinking to himself "I can't wait for my new arm" while watching Boothill fight from the corner of his eye, excited at the new possibilities a robotic limb will give him.

Once the two were finished, they finally make the rest of the trek up to the large gate. And as they approach, Katsuki can feel goosebumps rise on his forearms. This was the real challenge, now. Hearing what those doppleganger versions of himself had to say. He was curious how easy it was going to be for Boothill to accept his truths. Or if he was more stubborn and embarrassed to, like Katsuki.]

The final battle is ahead of us. We're about to be faced with clones. A lot of clones. And they're each gonna say some bullshit that'll either be a truth you probably don't wanna hear, or a really stupid lie.

[Katsuki braces himself, visibly anxious and when they get to the large door he reaches with his left hand to touch it. And nods at Boothill to do the same.]