simple and good, old school vibe, the twist that made the villain get a chance was as cliche as slipping on a banana peel but the author didn't want to make the rengade a strong guy, just some idiot that "found a gun" and thought himself invincible.
Read this after hearing the sumo guy in the new chapter of Kagurabachi originated from here, pretty cool oneshot. Love seeing the origins of newer authors.