>>723577319 (OP)
Man, this scene felt so sad. I rushed through my first playthrough and missed the nun entirely. A year later, I played through again, and this scene hit me out of nowhere.
He is a grown man, a gunslinger, a brute of a notorious gang with a $200,000 bounty (in today's money) on his head, wanted dead or alive. Nothing scares him, not even dying. But the looming death, and the knowledge that it's definitely coming and not entirely in his hands this time, breaks him.
His father figure is leading their family to doom, slowly but surely. Arthur stays loyal to him. He didn't do enough to keep his family safe. People are dying one by one. His only son, dead. His girl, gone. He wants to do something for those who remain, but he's afraid. What if he fails? What if he dies before saving them?
But Sister Calderon's words about believing love exists by doing a loving act push him forward. He does what needs to be done to get the people he loves to safety. He doesn't try to fix his wrongdoings or seek forgiveness or redemption, he just does loving acts of kindness. And in doing so, he gains redemption.
RIP, Cowboy.