The Mishnah taught that those who killed in error went into banishment. One would go into banishment if, for example, while one was pushing a roller on a roof, the roller slipped over, fell, and killed someone. One would go into banishment if while one was lowering a cask, it fell down and killed someone. One would go into banishment if while coming down a ladder, one fell and killed someone. But one would "not" go into banishment if while pulling "up" the roller it fell back and killed someone, or while "raising" a bucket the rope snapped and the falling bucket killed someone, or while going "up" a ladder one fell down and killed someone. The Mishnah's general principle was that whenever the death occurred in the course of a downward movement, the culpable person went into banishment, but if the death did not occur in the course of a downward movement, the person did not go into banishment. If while chopping wood, the iron slipped from the ax handle and killed someone, Rabbi taught that the person did not go into banishment, but the sages said that the person did go into banishment. If from the split log rebounding killed someone, Rabbi said that the person went into banishment, but the sages said that the person did not go into banishment.