Nothing states that he saw her though, just that she saw him from her door. It could have barely been open if she was just peeking out so he didn’t notice?What amazes me is the fact he KNEW he was seen by a witness after the crimes and he still went to classes and acted normal and went back to the scene after.
I mean, that's fucked up and scary!
If he knows he has been seen and he’s still claiming innocence… god knows what is passing through his head