In SC4 it takes 3 - 4 frames to 2G, so an empty 3B could lessen to -12 to -13, plus the timing they would do for FC A. so it could be -10 to -13. yeah i know that FC As were i13, but the timing is kinda strict. if it took 3 frames to 2G then yeah its punishable, but with the mix up your actually keeping the opponent at bay from doing serious punishment.