Any similar issues with ch2->3? He went from being in front of them on a turtle, to trying and sneak into city with noone near. Could just be a skip, but that also felt abrupt.
That one felt abrupt, but not as broken as this one. There is also a notable difference in page count.
The whole story is very rushed to begin with, as if the author has little interest in actually telling a story. It feels more like a first draft than an actual story. The result of a brainstorming session put on paper without elaborating anything. "So, dragons, demon, giant turtle and serial killer samurai undead. I think we're on a roll, keep the ideas coming. What about the MC? Just put OP invulnerable undead adventurer and we're good. It's not like anybody cares about backstory or character development."