I do like the ear wax line. Its like what Haremmony says, he is boasting that once you encounter him, its too late, you are dead, and the ones fighting him don't even realize this. Its kinda funny that Yakkou replies by acting like he didn't hear him.
Anyways, those last pages were real amazing, I could feel Usogui's heartbeat skip. As for Arata, he was an interesting villain that didn't have much time to be explored. But I guess his role is over with this and most of his characterization here works mostly as characterization for Lalo too.