Describe the events that lead up to the incident between Curley and Lennie.

Curley returns with Whit, Carlson and Slim. Curley has accused Slim of eying his wife, a charge which Slim and the others laugh off. Lennie, who is still dreaming about the rabbits, also smiles, which leads Curley to confront him aggressively. Curley punches Lennie in the face. Lennie does not immediately fight back, instead crying and calling to George for help. When Curley doesn't back off, George tells Lennie to "get 'em." Lennie catches Curley's next punch in his massive paw and crushes down on his hand.