Right? I'm obviously good at mysteries and he's breaking video cameras and drawing weird symbols. Nothing about that says "good at handling this alone."

I don't think you told me that.

[Either that or he didn't listen because why would Dipper ever not bring a thing up.]

Yeah, this is my sister. Alex, Mabel. Mabel, that jerk I was telling you about.

[Which he's already said out loud but that's not as fun as insulting someone to their face. Or their phone.]

I don't suppose this is the part where you tell us what it was related to, right?