When Matt first pulls a gun on Richard Strout, what does he order Strout to do?

In "Killings," by Andre Dubus, Matt is a grieving father whose son, Frank, has been murdered by Richard Strout. The reader learns that Frank has been dating Mary Ann Strout, who was just recently separated from Strout. Frank returns home one night beaten and bruised. He informs his parents that Strout is the one that did it. Soon after, Strout, described as being "too hot-tempered," shoots and kills Frank as he is with Mary Ann and her two sons.
Matt shares with his friend, Willis, that it is difficult for his wife to see Strout out on bail. Matt also informs him that he has a gun that he carries with him. One night, after Strout is leaving his job as a bartender, Matt and Willis are waiting for him near Strout's car. Matt's first directions to Frank are, "Don't talk. Unlock the front and back and get in."