Sam heard the answering response, and for a split second he thought he recognised the voice, but that wasn't possible. Jo Harvelle was dead. He raised a hand to his head, trying to get some clarity, but he couldn't get the thought out of his head. That was Jo Harvelle's voice.
Sam took off at a trot, moving toward the voice. Whether or not it was Jo, and Sam knew it couldn't be, he wanted to find the person. Maybe she had some answers, maybe she could tell him where he was if nothing else.
"Hello? Hey, can you hear me?" Sam thought he might be close enough to initiate a conversation. He was shouting, but it was worth it if she responded.