The feet to his chest sent the Joker staggering backwards and he fell back. He got up though as the figure started taking out his henchmen and he arched a brow. He had no idea who this was but it was clear it wasn't the Boy Blunder. He did, however, note the fear and he smirked.
"You're in over your head with me," he returned. He found himself wishing Harley was here. She could deal with this upstart while he made his get away with the jewels. Still... He darted his eyes over to the henchman behind and to the side of him. Vinnie caught the look and, grabbing what bags he could, took off.
Joker pulled a gun out and watched the girl. "I'm feeling generous. I had some fun inside. So you can either go and save your skin or...well I have to think of something to do with the skin I'll take from you." His other hand produced a knife, his eyes sadistic and gleeful.