It's line of sight rules. I've played enough different games that I can safely tell you that any set of line of sight rules will lead to "arguing and BS". Especially if you're used to a different set of rules. All line of sight rules end up being arbitrary and capricious. That's just how it is. I mean, this is how many years in the future, and the Combined Army remotes have the same vision limitations as some human's G:Sync robot. How is that realistic? And why aren't these advanced, well trained troopers turning around when someone gets within their zone of control? In this game, troopers have 180 degree front arcs. In Malifaux, they don't. In Warmachine/Hordes, they do. In Warmachine/Hordes, the line of sight rules aren't quite the same as the current Errata line of sight rules. In Warmachine/Hordes, the green trooper can't see the blue trooper because of the corner (because of a difference in one sentence). In Malifaux, there's no facing so the blue and green troopers can see each other. Three different games, three different results whether the models around a corner can see each other.