Sentence 1: Rufus is late meeting his friends at happy hour. 
 Sentence 3: Rufus decides he needs to get a beer and join them 
 Sentence 4:  He goes to the bar and orders one beer 
 Sentence 5:  Rufus feels glad that he can finally join his friends 
 Option 1: To make up for being late, Rufus buys a shot for him and all of his friends. 
 Option 2: When he arrives, all of his friends are already there.