Sentence 1: A man walked down the street and stopped to take out his phone. 
 Sentence 3: The man asked the robber what would happened if he didn't comply 
 Sentence 4:  Without saying anything, the robber brandished a gun 
 Sentence 5:  The man thought he was bluffing so he ran away 
 Option 1: Suddenly a robber appeared and demanded the phone. 
 Option 2: Suddenly a police officer appeared and demanded the phone.