This seems like a convenient moment for Tamatoa to lean in close, listening for more voices, but also letting his stalk eyes roam around the surface of the orb. With Peridot, Steven, and Lapis briefly piled out of the window, there is the glimmer of something incredibly shiny, and also just outside of the crab's enormous grasp. How infuriating!

He knocks his claw against the exterior of the bubble one more time, making a sound of annoyance.

"You can't fool me, little mers," he booms, sounding proud of himself for how observant he is. "I can see the treasures you are hiding in there!" He clasps a giant claw around the outside of the bubble, hefting the entire thing up to raise it to his eye level. "Now... come on out and share. I'm sure we can come to some kind of... arrangement?"

Like him taking your treasure and also eating you, that sound great.