“I’ll go see him,” Nick said to George. “Where does he live?”
Nick says that he will go see Ole Andreson, even though the others tell him that he does not have to if he does not want to.
This fits with Hemingways "code hero", because: He is put in a difficult situation where he has to decide which could result in either succes or fail. So here he has a "moment of truth." He is very manly and courageous to go and talk to him even though it is dangerous. He shows "grace under pressure".