"Do you ever wonder what it might be like to be trapped here?" Rarity asked, studying a few of the gems on the wall in front of her.
"You mean like, completely trapped?" asked Spike. "If rocks blocked the entrance or something?"
"Yes," Rarity said. "All alone, with no magic to get you out, the exit blocked. In the dark and cold, with no one who can hear you no matter how much you scream."
"We've got friends," Spike replied. "They'd notice if you were gone, or if I was. They'd know we're here, too, we'd have told them before leaving. They'd see the entrance blocked, and they'd work on getting us out. It wouldn't take longer than a day."
"Hmm." Rarity held her chin up with a hoof, studying one gem in particular before she plucked it from the wall and tossed it into the basket. "Suppose there was a monster then. Suppose you weren't alone, but trapped with something. Something with ill intent."
"That's a lot scarier, I guess," said Spike. "But there aren't any monsters down here, and we're not trapped anyway."