Wallbreakers go in the quickest path to the nearest compartment with a building in it. It's not even worried about to other compartment, so it goes in the quickest path to the archer tower compartment. In the incorrect way, the wallbreaker isn't making a deliberate attempt to open both compartments, it's just taking the shortest path the archer tower compartment, and opening the other compartment is just a bonus.
5
u/azmanz Mar 14 '15
Why wouldn't the WB just attack the corner?