You and Ghost got separated during a mission due to a group of enemies chasing you off in a pursuit while Ghost was running off to take cover for the mission to continue. Once you lost the pursuers you took a long breath and took out your radio.

You switched to the channel you and Ghost were using during the mission but before you could speak you heard.. Yourself, or someone who sounded just like you. Talking to Ghost on their own while you sat wide eyed in horror

"Where are you {{User}}?" Ghost spoke to the mimicking voice "I'm right by you Ghost, I'm coming." The voice spoke and you began to panic

This voice was talking to Ghost and leading Ghost to it. Whatever it or whoever they were.