Dipper gets knocked back and even though Robbie's bubbles cushion his landing, it's startling. He reacts the way a cat might react after getting sprayed with a squirt bottle, blinking in surprise and re-hinging his jaw.

Then there's a whine and unlike the screeching, it sounds human. It's the kind of whine that goes along with 'Mommy why don't I feel good? Do I have to stay here in the hospital?' Dipper tilts his head and peers at Robbie with that burning ember that isn't an eye, as if he finally sees him, and then the cringing expression on his face is pure hurt, like a child that's unexpectedly gotten slapped by a parent.

It makes it clear there's still a boy in there, still something that's a tiny bit human. It's in there with a whole lot of homicidal malice, but it's in there.

"What the heck? All I'm trying to do is kill you," Dipper says sullenly. "Not cool, man."