I'm so scared for Heidi too. And that Colin is super creepy, goes to intimidate Heidi, realizes she doesn't remember him, comes up with a backstory that hits her buttons and has sex with her?! Yikes he is calculating. Makes me think that he isn't part of whatever took away Heidi's memories so who did that?
And Walter, I'm hoping he is not a shell of a person but it doesn't sound good.