The scene in the barn when they see the sick horse, Lucas shirt is wet when he throws the first punch. Next fighting scenes his shirt is dry. At the end Lucas shirt is wet again when Lucas says “we make a good team son” I think Lucas with wet shirt was Chuck and the other scenes was stuntman. Thanks wildwest!
*It's hard to show this, you need to watch the episode to see it better.
You can tell in the picture above to the right is a stuntman, to me it looks like Fritz Ford. Cowgirl!