Nothing in this episode makes sense. Mariano's a punk from the beginning, riding into town shooting bullets into the air and causing chaos. He somehow happens to know that the Barkley boys are dining at the Cattlemen's Hotel at precisely that hour, and rides up with his buddies and brings a calf into the restaurant as a gift to Nick. Nobody seems to have a problem with this gesture, but rather everyone sees it as a great joke.
Moments later, when Mariano tells the tale of how Nick saved him from jail by covering his misdeed to the sheriff, Mariano lies to the brothers about what really happened. This is evidence that he really is a bad dude through and through - unchanged. Then, when the anthrax diagnosis is given and Mariano is completely unreasonable, Nick still tries to show him mercy, saying that Mariano is justified in his deadly decision not to destroy the infected cattle because he had a tough growing up. Bull. Nick by nature would have shot them dead on the spot, as would any good cowboy.
Then, there was the whole goofy thing with the anthrax vaccine. When Mariano insisted that they sacrifice their prize bull, and Victoria said "Go for it," I wanted to hurl. The doctor should have stuck the needle in ol' Mariano and sent him out to pasture.
What was most irksome about this episode was Mariano's racist ingratitude. Referring to Nick's kindness as "gringo hospitality" was a bit repulsive. There's an old saying, "Fool me once, shame on you. Fool me twice, shame on me." The Barkley's don't seem to mind what a dirtball Mariano is, they insist on keeping company with him even up to the last scene.
One last item to add to this tale of nitwittery: the anthrax vaccine wasn't invented when this episode aired (but close enough); however, what's really funny is how it's administered. Anthrax in the 1800s was a preventive vaccine. The shot would have been given BEFORE the animals were subjected to the infection.
But, one positive: we get a glimpse of Nick's well-furbished bedroom - very rich, masculine Victorian digs!