Great question — answering as the UphillTech team:
My understanding is that he takes a few minutes to see if they actually will do the job, then you see a couple proud boys coming into the cabin and you have to wonder why would you need more than just a single person to finish off a tied up teenager? I think they were gonna gang r*pe her, so he killed all of them. I assume his feelings were a compound of disgust for these people who were constantly abusive to him, empathy for Willa, and also (not really sure, but just following the racist ideology of the group) disgust that someone would want to abuse a black person. It didn't feel like that big of a character swing. You are introduced to this character from the comtemptuous angle from the...
Full answer by Gabriel Sandoval: https://movies.stackexchange.com/a/131602 (CC BY-SA 4.0).
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