Memory loss is a vague thing tbh there's not always a reason for why a memory suddenly comes back.
I'm guessing seeing her threatening Ren just got Haru defensive and recalls previous bad memories with that woman unconsciously
Well, her previous attack is what caused his memory loss in the first place, so in a weird way, it kinda makes sense that this attack brings his memory back...
I feel like the old Haru suddenly rushed out because Ren was in danger. He came back to save him.
I started yelling happily when Haru spoke the words that sent that crazy woman away the first time, but now I'm angry because...
1) how was her attack what triggered the recovery? it doesn't make sense to me, so can someone explain a bit??? it was too quick, though, i'm lowkey glad for ren
and
2) i love haru, but i will not hesitate to sucker punch him in the gut for causing so much pain to precious ren-ren