When Doc returns to Dodge, Matt and Chester are frustrated with him when he refuses to tell where he has been. He shares how he was confronted by gunmen about one of their gang who died after being treated by the medicine man. They alternately want to kill him, and want his services. In the end, he promises to not tell who they are, and keeps his word by not even revealing their names to Matt and Chester. It’s not that Doc is supporting the bandits, but he has a higher calling to practice medicine no matter who his patients might be.
Though Doc feels obligated to hold to his standards, and keep his secret, Matt has enough information to go on the trail of bringing justice for the man the bandits killed. Doc is a man of integrity, but men are judged by the standards of the one doing the judging. Being bandits, and men of low virtue, they assume that Doc has the same low standards that they do, and he won’t keep their secret. Working with Matt, Doc agrees to be used as bait for a trap.
The trap is sprung, and it isn’t until the bandits have paid their price to Matt’s blazing guns that Doc finally points out the man he knows to be the killer.