Jon held the stone (which was actually The Literal Stone) in his hand and said "I wish someone heard me yelling." The stone glowed, giving Jon a better look at his current surroundings. But it didn't really help much. There was just no way to climb out of there. He was trapped. Until someone got him out, anyway. But now since he made a wish ...
"How long do you think we'll be in here?" a voice suddenly asked, startling Jon. If there were room for it, Jon would have hit the ceiling.
He looked to his left. That was where the voice was coming from. "Who's there?" Jon asked.
"The same person who's been here for the last ten minutes?" the voice said. "Come on, Jon. This situation is already crazy as it is. Don't you go weird on me too. I already got an earful of you yelling for five minutes."
Jon's eyes went wide, as he realized what the stone had done. He wished that someone had heard him yelling, so the stone made it so that someone was trapped in the wall with him. But who was this person? It was so dark, he couldn't see.
"Please," Jon said. "Just tell me who you are."