When the Taylor's caught sight of some strangers looting the Kendall ranch house, the bad guys were all mounted on dark colored horses to make their get away. When the Taylor's ran into Steve Bowie (Starrett), Lucky Laidlaw (Hayden) and Harmony Bumpas (Edwards) giving chase, they mistook them for the bad guys, but Steve was riding a white horse and Lucky was on a palomino. The trio shouldn't have had to explain themselves if anyone in the Taylor party was paying attention.
After Steve gets knocked down by one of Larsen's henchmen, the outlaw is about to shoot him when Lucky rides in to make the save, but to do it, Lucky shoots the gun out of the bad guy's hand through the slats of a rail fence, a virtual impossibility.
After Steve, Lucky and Harmony established their identities with the Taylor's they ride off to the Taylor ranch. At this point we don't know their names yet, but Steve calls Mr. Taylor by his own name.