Redundant Lookout: A gang carry out a bank robbery. One gang member—Bob—is tasked with acting as a lookout (though the gang would still have proceeded with the robbery in the absence of a lookout). However, Bob falls asleep immediately. During the robbery, the gang threaten to kill Witness. Passer-By spots the situation and realizes that the only way to save Witness is to shoot Bob, which will cause the robbers to flee. (Adapted from Bazargan 2013: 182–183)