What happened at the start of the presentation when Musk was just about to start talking about safety features when suddenly, quietly, and slowly, a Model X dro

What happened at the start of the presentation when Musk was just about to start talking about safety features when suddenly, quietly, and slowly, a Model X drove up onto the stage. A random guy stepped out, left the door open, and handed Musk the keys. Musk: "..Right, so about those safety features." Did the guy go up to early? Or was he late? Or was that planned? So confused...