[For Baymax, it was also an unexpected surprise to power back on inside an apartment not his own. He knows this isn't the home to the Hamadas and while that's concerning, it's still his job to help the sick and injured. So. His armor's off to the side and Baymax in all of his squishiness steps out from his charger and has since been trying to "help" Dipper. Sorry, Dipper.

When Hiro answers the call he's quickly scrubbing his face because shut up he wasn't freaking out, you were freaking out. Upon seeing what Dipper's showing him though he grins suddenly.]

Baymax! […wait.] What're you doing?

Hello, Hiro. [He's still trying to hug Dipper, excuse him, partner.] I woke up in my charging station here after our adventure in the jungle. I believe I was brought to the wrong place.

You think? [And then, to Dipper:] Sorry. I don't know--he got left behind in the jungle when we all split up, I don't know how he got back. [Now that he knows Baymax is safe? He's a little amused at Dipper's plight.] His armor and everything's still there, right?

[Dipper gets a headpat for his troubles.]