In the mission[Chapter 3] where you track Bounty hunters to rescue Trelawny, there's a hidden badass cutscene with Arthur that happens only when you shoot one of them instead of beating them.
In an alternate universe, Arthur Morgan learns sword dancing to pay for his medical bills. I present to you, The Magnificent Morgan!
Third playthrough and first time noticing you can kill the racist dude in Saint Denis with no bounty.