The screeching actually turns to chortling laughter and Dipper re-hinges his jaw so he can laugh properly.

"Points for making me laugh with your timing before I eat you." He doesn't stop chasing them, but they totally deserve credit for such a quick and hilariously timed noping out of the situation. "C'mooon, guys. I just want to kill you a little. Occupational hazard, right?"

In a voice that's less gleeful, he goes for the throat. What he says isn't him and his voice even sounds alien for a moment, as if something else is speaking through him, trying to use Dipper's voice to cause hurt.

"You big bro dibsed me, remember? Fat lot of good that did."