Just watch out to the direction the gun is pointing at the forelast page. It should be horizontally flipped in order to be coherent with the previous page (ol' Cody looking to the right, so the youngster's gun would logically point left, to face him).
This is a great way to tell the story...making the panels appear in the way you want them to almost eliminates the problem many comic artists have with their pages, which is making the storytelling flow. I like the parts where he shoots the cigarette and puts his gun away, but I'm thinking the panel where he's holding out the gun would be better facing the other way. The comic gives off a feel like the old guy's on the left and the young guy's on the right, so with the gun pointing from left to right, it feels like a jarring transition. For a second I thought the old guy got attacked from behind.
Well the thing is, that there is no left and right in this because they're on a main street. Also I wanted to showcase the gun and since the stranger is left handed the gun would get better exposure being seen from the other side of the hand than the back.
I don't like the connotations behind the title of this series, especially once you showed us those two kids... Guess I'll just have to wait for part III to find out if my worries are based in anything other than a bad gut feeling.