Yes and being able to target the limb in a prone position, is subject to plot, most of the time those sort of attacks are easy to dodge/block.
Kid's arm was not targeted here by BM but he was given a slash here to some area of his body so it would not bisect him, and he may or may not have used some metal to defend given the vagueness of the collision. I don't know why you are using this to think randomly scale Shank's crew members over BM.