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If you're pertaining to Walter himself, we really don't know. But the 'Past' is something, and the Wayfinder compass did something over there. We know it's tragic because of how Lars and coach Gil tries to hide ot from us now, and we also know that Mark's brother died from the incident (which I personally like to think). I guess more will be revealed from the upcoming days or episode even.
It's all in Mark's episode, he saw a person similar with Walter's look when he first came to Highwell, as well as at the park. He even contacted Walter where he is, and he replied he's in school.
Although, these are pretty much speculation, Herbert's arrival is intended by their parents. Or atleast I want to think of
Well the obvious parts is something tragic happened. No one who was there wants to bring it up. What could have caused his amnesia is still a mystery. Could be head trauma or it could be emotional trauma. Considering he had to stay home and recover I am going with something physical. / I do find the ~8 year age difference a bit weird between Walter and the non student cast. However that could be another clue to what happened in his past considering not many situations come up where kids and teens are just eft unattended and could get hurt. Perhaps a kind of boy scouts or camping trip? / I believe we might get more info on days 9 and 10 especially since the beach trip has lead to Walter uncovering more about his past and repressed memories resurfacing to the point where he is now aware this might not be the first time he has met this cast of friends. Be patient. More will be revealed soon enough.
It sounds like they all went out to a cliff (Probably Parker's idea since he's a guilty lil fuk), something went wrong, and Mark's brother ended up dying and Walter got hurt. I think Herbert also says what happened to Mark's brother was Walter's fault which I'm kinda inclined to believe since Walter is lowkey unhinged. I'm wondering whether or not he yeeted a kid or if it was an accident.
Then there's the weird identity thing that kinda implies Walter yoinked his identity from his twin. Like, the weird scene with Talbot, Walter's name changes to Herbert backwards or something like that when he's being unhinged. And the dream in Parker's route where Dream Walter calls Walter "Herbert" and asks how long hes going to keep lying to himself when he denies being him.
But the weird thing is, based on Gil's route day 7, Walter and Herbert became distant after the accident. Maybe neither Walter nor Herbert doesn't want to take responsibility for the accident?
And how in Mark's episode, he saw someone who looked like Walter even before Walter came to Highwell. Maybe Herbert knew their childhood friends now live Highwell (especially at Highwell University) and somehow convinced Walter's parents to let Walter move out to Highwell to make Walter remember the accident?
edit: minor Gil's day 8 spoiler down below
This could explain the hooded figure on Gil's day 8, "This voice, is it really him??". Maybe it's Herbert trying to spy on Walter in case he remembers anything and takes the blame on Walter?
(again all of this is a wild guess lmao)
My theory on Herbert and Walter's relationship is that Walter and Mark were best friends while Herbert was best friends with Mark's brother. Herbert blamed Walter for his best friend's death and that's what caused them to become distant. Now Herbert is sneaking around Highwell and messing with all the guys to possibly turn them against Walter or something like that for revenge. **Gil Day 8 Spoilers**
If he is gonna turn them against Walter, he might tell Gil some unsavory truths about him to do so at the end of his Day 8. Though I'm p sure most of them are somewhat aware of that Walter's kinda "off" just from Mark and Parker getting worried and visibly upset when he tells them he was told he moved like he had some fighting experience.
It looks there lots of thing to unpack.
The person who gave Walter the pendant must be Lars I believe since they have the same pendant.
Every characters seemed to know each other as their childhood friends.
Like Mark, his brother, Walter and his twin, there's a connecting with them for sure. I still dont get the revenge thing they mentioned. And who's the mysterious guy that keep pushing Mark to get his brother revenge?
Walter keeps getting flashbacks of his childhood moments, but it doesn't help me abit... Haha
Again I can't seem to put everything into 1 piece. The connection right now is just all over the place 🤣