Wow. Killing people is great. He missed having this surge of power at his fingertips.
He's tired of stalking Lily. He wants to make sure she's okay (that everyone knows she's his) but he doesn't have to keep an eye on her all the time. After he kills Tintin, he mutters in Mandarin until he figures out a rhyme and then tells his magic that he wants it to tell him if Lily is scared or upset and where she is.
Then he goes back to the cafeteria to eat some of the food. (There's so much of it. He's never had this much food in his life.) Then he sits down at a table and starts looking around for something fun.