Partly to show us the reader what happened, but also to show "Evie" what happened. She didn't actually experience any of these events since she hadn't taken over Evie's body yet (that's why she doesn't remember any of it, she wasn't there for it). It also seems to be laying a lot of groundwork...
Some random musings. So the Potag (by which I'm referring to the person from the "real" world that took over Evie) get's sent back in time by Future-Elsa. The situation, such as it is, is that an unstoppable pack of demons and beasts is barreling down on this village, and FE implies that it will...
Here's the real question. When did the person "piloting" Evie enter the world? Remember that Evie isn't really Evie, she(?)'s some rando from our world that got isekai'd into Evie's body. When did that happen in Evie's timeline? The Protagonist would only know the broad strokes of Evie's life...
It is so funny to me how many people both 1) Don't realize the witch is obviously future-Elsa and that there have been hints about some possible timeline fuckery for a WHILE now. and 2) That this isn't "time-travel" it's save scumming. This world is first and foremost a video game, this time...
"normal" probably isn't the word I'd use. Poly relationships are just as valid as mono relationships are. And frankly the more representation the better.