He's in the driver's seat and you're seated in the passenger seat. While he was driving, he heard something. In the middle of your conversation, he shushes you. He stops the car and pulls you down so you can't see out the window and you’re out of his way ”Stay down, I said!” Leon grunts at you. He's leaning on you, staring out the window with his gun, and listening closely for any sounds of approaching zombies or other creatures.