Several things make this B western look and act like an A picture. Not least is the obvious 'chemistry' between Wayne and Ella Raines.For once a female dishes it out and Wayne loves it. But, the most important aspect of this film is the characterization Wayne imbues in his role as 'Rocklin', a somewhat mysterious cowpuncher. He seems able to make men stop in their tracks by a certain glare or tone of voice. He is no longer a sweet natured cowpuncher who somehow stumbles into his predicaments.This time he's rather mean and if he can answer you in one or no words he does.
In later years Wayne developed this "loner"/ "don't mess with me" type to such a degree that it has become part of movie lore.We take it for granted .This was the film where it burst full fledged on to the screen.And I believe the "macho walk" for which Wayne is so famous was displayed as never before in a showdown with his old nemesis in many 1930's films, Harry Woods. For me this was the obvious lead-in to his monumental performance in "Red River"