Dipper just rolls his eyes at her acting like not wanting to get eaten is allll him. Right. (It's an affectionate eye-roll, though. He's missed rolling his eyes at her.)

"The bus isn't here. Time travel and interdimensional travel, remember? This isn't even where I was. This is a thing that one cosmic being does. The Time Trapper creates these little mini-worlds to throw us into to challenge us. Waddles and the bus are back home."

It's important for her to understand that so she doesn't think Waddles is in danger.

"We need to get to higher ground," he says, running towards the staircase. "It's too heavy to climb stairs so as long as we can get above its head --"

A completely alien prehistoric animal, some kind of land squid with three mouths filled with razor sharp teeth, suddenly appears at the top of the stairwell. It spits acid that starts making the flooring of the stairs bubble and smoke.

"Oooor not. Outside. It's inside right now, so let's go outside and then try to find a way to get higher."

He turns to the nearby door to see four feathered Deinonychuses walking in.

Dipper balls his hands into fists.

"Oh come on!"

This isn't fair. But there is a way the odds can be evened out. He turns to his sister and grabs her by the shoulders.

"Mabel, do you randomly have superpowers?" He knows that happens sometimes, to the people that show up in these weird bubble universes. "Try blowing something up with your brain!"

A pause. "Wait."

Realizing she's looking at him at the moment, he pivots her to face the raptors.

"Now try blowing something up with your brain!"

He has his teke but this will be a whole lot easier if she's developed powers, too.