Klonoa doesn't notice the shield lifting until Frisk is there, but as soon as he does, he's backing up, hands out in front of him.

"Okay, okay, that's sounding like a good idea."

Klonoa turns to look at the way they came, or, more explicitly, the ground beneath them where the doorway was blocked. Is there another way out? If need be, he's got quite the skillset to moving large objects or blowing away debris with wind magic!