Sentence 1: Blake took out his revolver and cocked it. 
 Sentence 3: He fired the revolver and a deafening roar howled through the canyon 
 Sentence 4:  When he looked at the target, no bullet holes were there 
 Sentence 5:  However, his trusted donkey, Fred, was dead 
 Given Sentence 2: He aimed at the target slowly but steadily.