Danielle noticed something odd. There was no sound of someone scurrying through something. She put her finger on Alex's lips. She whispered into his ear, "I think he heard us. He's stopped doing whatever he's doing. We better think of something to cover it... fast."

So she started laughing and thankfully, it seemed natural. Alex started laughing as well. She did that so it would seem like either one of them had been making a joke.