It’s funny because that only ever gets explained in the bonus features (it’s available as a DLC or on the Move Edition disc).
In fact the explanation for this got cut out of the game because apparently they didn’t want to add any ‘paranormal’ features (but if they KEPT it, Ethan’s blackouts would be EXPLAINED so there wouldn’t be any but I digress)
What David Cage claims was the case, when Scott was present during Jayson’s death ‘some sort of bond’ created between them. And, thus far, every time Scott folds an origami figure, Ethan has a blackout AND folds one himself, the exact same one Scott folds.. What was ALSO cut out from the game, were Ethan’s -blackout sequences-. Yes, they actually existed! They were based around the area around him getting drowned in water, and the player was meant to swim around in their sunken house/in the park/so on, so forth.
That also explains why Ethan always ended up on Carnaby Street when he came to after the blackout — every time Scott folds a figure, he certainly thinks of his brother and his death, having taken place nowhere else but in the Carnaby Street corner’s building works.
Personally, I would have like it so much better if they left it all in, especially since the suspicion of Ethan being the Origami Killer at first would have been greater — I mean, sure, his psychologist does mention he’s seeing drowning bodies, but that doesn’t leave that much of an impact (at least didn’t for me, when I first played it) — the underwater sequences would have been something really interesting.
But yeah, Quantic Dream? Next time leave the cool stuff in. (ALSO WOULD BE NICE IF YOU DIDN’T GIVE UP ON CHRONICLES SOBS)