>>5273011/x/ always thinks that everything which can change its shape is a fucking Wendigo.
The chance to meet a cursed undead Native American in Mexico is low I guess.
Well also just imagine your are a mighty creature from a plain between other world which visits from time to time this world to hunt animals and humans and you will stop doing so because you touched some white ash...
I don't know which rules are really bound to their behaviour, but I think fighting something otherworldly with something common what is not even magical object or physical weapon is a bad idea and just humbug.
The skinwalker candidates you will most likely find are nature ghosts of the creatures of the woods itself.
Beware explicit from foxes, reports and tales about their shapeshifting and mischievousness aren't just from the land of weebs.