A short Shank comes out of your Tank barrel and stabs any enemy it hits, it does not alter the terrain but it can pass through it. Though the effect radius is not clearly determinable, there is a practical trick which helps you calculate whether Shank will hit your target or not, based on the length of your shot bar (the "white part" of your shot bar, which can be calculated in "power units" ranging from power 0 to power 100). Specifically, if the distance between you and your target is less than ~29 "power units", Shank will hit its target.