I was curious about this so I went looking for it. The episode Kathryn is talking about is Tree People. She is correct. Nick had a dream where he saw Zerstorer. It's odd that this conversation never caught on. It would have made for a very interesting discussion.
Monroe:So you felt the arm come through the mirror in the spice shop?
Eve: I saw it first, and then I felt it.
Nick:It choked her.
Wu:And we're talking that same skull creature you and Eve saw in this bathroom mirror.
Nick:Yes.
Hank:Anybody else seen anything in your mirror since?
Nick:Not me.
Adalind: No, but I don't think we would. It seems to be connected to Eve, or...
Eve: Or?
Adalind:Or it's after her. These spirits and entities sometimes have a way of attaching themselves to people of our world.
Rosalee:But when Eve saw it here, so did Nick. Maybe it's after Nick too.
Monroe:That makes sense. I mean, Nick and Eve are pretty deeply connected. I mean, you know, they were.
Hank:And you haven't seen it any place else?
Nick: Just a dream.
Wu:Must've been one hell of a dream.
Diana: (She comes out of Nick and Adalind's room). That wasn't a dream.
Adalind:Honey, you don't have to worry about this. We can take care of it.
Diana:I don't think so.
Rosalee: Diana, if it wasn't a dream, what was it?
Diana:I don't know what you call it.
Monroe:Is it something that's not a dream, but it's also not real?
Diana:It's something that's not real yet.
Eve:Something that's going to happen?
Diana:Uh-huh.
Nick: Do you know where?
Diana:In the other place, through the hole in the mirror.
Monroe: I'm sorry, "Through the hole in the mirror"? Okay, we need a buddy system 'cause nobody can look into a mirror by themselves until we figure this out.
Rosalee:She puts her arm around Eve. And you are staying at our place until we do.
Eve nods
Monroe:So you felt the arm come through the mirror in the spice shop?
Eve: I saw it first, and then I felt it.
Nick:It choked her.
Wu:And we're talking that same skull creature you and Eve saw in this bathroom mirror.
Nick:Yes.
Hank:Anybody else seen anything in your mirror since?
Nick:Not me.
Adalind: No, but I don't think we would. It seems to be connected to Eve, or...
Eve: Or?
Adalind:Or it's after her. These spirits and entities sometimes have a way of attaching themselves to people of our world.
Rosalee:But when Eve saw it here, so did Nick. Maybe it's after Nick too.
Monroe:That makes sense. I mean, Nick and Eve are pretty deeply connected. I mean, you know, they were.
Hank:And you haven't seen it any place else?
Nick: Just a dream.
Wu:Must've been one hell of a dream.
Diana: (She comes out of Nick and Adalind's room). That wasn't a dream.
Adalind:Honey, you don't have to worry about this. We can take care of it.
Diana:I don't think so.
Rosalee: Diana, if it wasn't a dream, what was it?
Diana:I don't know what you call it.
Monroe:Is it something that's not a dream, but it's also not real?
Diana:It's something that's not real yet.
Eve:Something that's going to happen?
Diana:Uh-huh.
Nick: Do you know where?
Diana:In the other place, through the hole in the mirror.
Monroe: I'm sorry, "Through the hole in the mirror"? Okay, we need a buddy system 'cause nobody can look into a mirror by themselves until we figure this out.
Rosalee:She puts her arm around Eve. And you are staying at our place until we do.
Eve nods
The best way to frustrate a cyberbully is to ignore him.