"How'd you make these?" you ask behind a forkful of chicken.
"Huh, your voice is really weird. Is mine that weird? I've got to get the channel more stable in the next version."
It is weird, but you're growing accustomed to the wobble in Darcy's voice. "The rocks?"
"Oh, right. It's a localized force channel between the rocks and into a thin membrane of force that surrounds you and keeps the sound waves localized."
Wait, holding the rock has you in a bubble? "Am I going to suffocate?"
"No way!" Darcy re-considers. "Not unless Dr. Lewis talks for a long time."
Which Is Extremely Possible, Actually