^ According to this discussion, ranged fire is supposed to apply Overwhelm, and to more than just the intended target… However, I was not able to apply Overwhelm to either the Marksman in the bushes (Even when a shot later hit him), or to the marksman who was being shot at behind this target.
Attached is a screenshot and log file of this event for your reference.
you can see the “brigant marksman turn done” – this means that he acted before your mustachioed one. A new “perk” (?) does not work in this case, according to it’s description.
I saw another problem with Overwhelm: the brigant’s leader was able to apply the effect Overwhelmed on brother who acted before leader in a round. Unfortunately the video with this moment is not available yet, but it is a fact.