It's not about the four-sided maps. Here's another example. Let's say the game is on the popular Castle map. A Guardian of Order is in the elevator. On one hand, it's an easy target, like the Hydras, but on the other hand, there are Phoenixes. Let's say one of the players kills one of the Hydras, and on the other hand, the guard is moved, and now it's just waiting to seize the castle at a convenient moment. I don't understand why the moved guard should fight according to the rules, but this kind of advantage isn't allowed.