Thomson argues that this follows from the fact that Falling Person in Ray Gun lacks a right to kill Victim. According to Thomson, this entails that Falling Person is under a duty not to kill Victim. Falling Person will fail in this duty—and thereby violate Victim’s right—just in case she does kill Victim. Since she is threatening to violate Victim’s right not to be killed, Falling Person lacks a right not to be killed. Hence, Victim may kill Falling Person to save his own life, even granting that Falling Person is morally innocent.