Penny's heart sunk as he implied that he was about to leave. If he left while he was angry with her, she wasn't sure she'd be able to get him to talk to her again, much less get him to visit her.
"Percy, you are not allowed to leave yet," she said boldly, moving to block his quickest route to the door. "Not while you're so upset. You know you'll just go home and brood on things by yourself and that's not good for you." Penelope put on an exaggerated pouty face, hoping to lighten the mood. "Besides, you can't leave me here by myself." Well, he definitely could. Penny didn't know if the sympathy routine would work on him again.