Victim has done nothing to forfeit his rights against being harmed: He poses no threat to Homeowner and lacks any intention to appear threatening. However, Homeowner’s evidence is that Victim poses a lethal threat to her. Victim is epistemically indistinguishable from a genuine threatener. Given this, Homeowner is not culpable or blameworthy for the fact that she threatens Victim. Nonetheless, it seems plausible that Homeowner is morally responsible for an objectively unjust threat to Victim. Defenders of the responsibility account hold that this renders Homeowner liable to defensive harm, which explains why Victim (or a third-party) is permitted to defensively kill her.