Megosztott hang

My little brother talks to someone every night… at 2:46 AM. My parents say it’s just his imagination. But last night… I heard it too. A second voice. I opened his door slowly. He was sitting upright in bed. Staring at nothing. Then he whispered: “He says… you can hear him too.” I turned on the light. Nothing. Silence. Then my brother smiled. And said: “He’s standing behind you.” I froze. Slowly… I turned around. Nothing was there. But then… Right next to my ear, a voice said: