One who aimed to kill an animal but killed a human, [or who aimed to kill] a gentile but killed a Jew, [or who aimed to kill] a premature baby but killed a viable one —- is exempt. [If] he aimed to strike him on his loins, and the force [of the blow] was not sufficient to kill at that spot, but it struck his chest where its force was sufficient to kill, and he died —- he is exempt. [If] he aimed to strike him on his chest, and the blow contained sufficient force to kill at that spot, but it struck his loins where its force was in- sufficient to kill, and he died —- he is exempt. [If] he aimed to strike an adult, and the force was not sufficient to kill an adult, but he struck a child, whom it was sufficient to kill, and he died —- he is exempt. [If] he aimed to strike a child, and the force was sufficient to kill a child, but he struck an adult, whom it was not sufficient to kill, and he died —- he is exempt. However, [if] he aimed to strike him on his loins, and the force was sufficient to kill at that spot, but he struck his chest, and he died —- he is liable. [If] he aimed to strike an adult, and the force was sufficient to kill an adult, but he struck a child, and he died —- he is liable. R’ Shimon says: Even [if] he aimed to kill this one and he killed that one he is exempt.