The Wilderness is Dionysus in his most primal form and when the girls ate Jackie while imagining themselves at a Greek feast, it was like them becoming possessed by the Wilderness and becoming its maenads. When they haunt Nat, it's like they become possessed again and go into an ecstatic frenzy. The maenad parallel becomes even more blatant when they get high on shroom stew and try to start an orgy with Travis which quickly flips into them hunting him while hallucinating a stag. Mythically, the maenads would work themselves up into a heightened state where they didn't recognize their own minds then partake in dances, orgies, and ritualistic dismembering of animals. The Yellowjackets were frenzied, insane, and become something else during their hunts. When they're snapped out of it, they legit are shocked that they almost killed Travis. There's at least two Greek myths where Dionysus causes young women to go insane only to come to after killing a loved one.