Maybe a drawing would help understanding, but I think I got it and will work on my post with this assumption.

The stagecoach is facing to the left from the defender's perspective because Loetta is at the left side near the driver's seat. Lars is at the back of the stagecoach. This whole side will be the defending side in my example.

The orc is going on the offense side through the middle because he jumped through the doorway and out the window into the defending side issuing a sort of challenge. I would likely have had Karvos run him through while he was going through the window but we can ignore this since it seems like the move it set on stone with the additional posts.

Meanwhile, the archer is moving into the stagecoach and Kirian is simply running right now.