"A shame, but at least they are indeed still friends.
"
___
Dipper: Oh dear...
Mabel: Wait up, Star! You don't know what's in there! "The twins followed and entered as well."
Wait! don't go in that door-!
"And then it slammed shut."
Ooh boy, they're in deep trouble...
We have to go in and save them! "Opens the door...only to be greeted by one of hte Deep Pythons from Majoras's Mask instead." NNNNOPE! Never mind, the door leads somewhere else now. Magic is definitely in effect, here.
Oh no, how are we ever going to find them now?!
We'll find a way through here. These doors may be constantly changing, but surely there are some signs we can follow to track them down! Trust in the Junior Woodchuck Guidebook!
"Marco was immediately seen in the strange bog location they four teenagers found themselves in."
Marco: Huh?! Wait! Don't let that door-! ...Close...
"And the door went flying away, trapping them all in here until they can track that door down...It didn't disappear, just fly off to another part of the forest."
Star: ...Heheh, at least we know you're safe, right...?
Marco: ...I've been trying to track down that exit door for ten minutes straight.
___
Lapis: You sound tired.
___
"He was still confused, but the electricity he was generating was gradually getting less intense, and he gazed up at her, his eyes still red."