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This is absolutely no place for children. You take dear, sweet CASEY into protective custody.
Author commentary: It's incredibly important that John takes Casey with him. First, the fated journey of the rabbit must continue. Second, Casey must continue on her/his journey toward becoming the legendary necromancer and ultimate savior of the final epic battle, Viceroy Bubbles Von Salamancer. Think I'm bullshitting you about this? I would never do that. How dare you.
Author commentary: Some tricky nonchronological stuff is happening again. From John's POV, we're skipping ahead to when Dave is already in the Medium. He was climbing the radio tower to get the egg just a few pages ago, so what happened? Dave makes it sound really bad, but we know this boy has a flair for melodrama, so who knows. Revealing what happened and how it happened, and the circumstances under which these facts are revealed, is the point the narrative is now marching toward. I had been stitching all this together in a fast-and-loose ad hoc manner, but at this point I felt like I had to start making some pacing adjustments to keep things more interesting. HS got so deep into the granular details of basic game activity, like kids trading codes to remove flower pots from a rocket, that at a certain point I had to dispense with the baby steps and start taking some big strides to move things along. We're about to see a lot of that, as Terezi kicks off her scheme here. WIth this intriguing little time skip, we've barely seen anything yet. The story's about to go bananas.
Yes, John is about to fuck something up over there. And yes, the bird is suggesting something weird to prototype with. We learn later through implication that Dave was being urged to prototype the sprite with Cal. Why? I don't know why the bird would want that. But I do know that the doll is chock-full of some rather Troubled Souls, who have a way of influencing others in unfortunate ways.