Zero Conditional tense uses

Read this excerpt from tim o’brien‘s “ambush” “i had already pulled the pin on a grenade. i had come to a crouch” which literary device is most clearly shown in this excerpt?

20 points plus brainlest answer if right. joe nesbo, a travelling salesman, was staying at a hotel for business. he was having a dinner meeting that night, so he decided to take a nap in the middle of the afternoon. he was awakened by a knock at the door, and then a man walked in. “oh my, i’m terribly sorry, this isn’t my room. , pardon the intrusion.” the man calmly backed out and left. nesbo got up and locked the door – something he forgot to do before his nap – and lay back down on the bed. but then he shot up in bed and called the lobby to tell them there was a burglar on the prowl. what made nesbo think that?

How did the industrial revolution shape the beliefs of the romantics