[Mercury walked over to the puddle of water where the ghost had been. She scanned it with her visor before reaching up to her earrings and letting it disappear.]

You were being chased by a ghost, and judging by your quick retreat, you lack the ability to fight them.

Why did you head towards the wall, Dipper? You could have gotten yourself killed. These are not exactly friendly ghosts looking to make friends and take people on adventures.