Kate's Quest passage

Here's a passage from Kate's Quest, later I'll add a video of the passage, but right now my siblings aren't ready. :) :

Kate winced at what he had said, "Um... Why haven't I met you?" she asked  

Annaliar frowned, “Why do you ask? I moved here yesterday.” he replied, looking more angry.

  “OK, I will hold onto that, but why are you walking around like you don’t want to be seen?” Kate pushed, she was desperate for answers.

  “Because I have to move to Earth to keep my job going, and my friend Zuxwoy doesn’t want me to go.” Annaliar lied. Kate could see his face pushing for her to believe.

“If you moved here yesterday, Zuxwoy wouldn’t be such good friends with you that he wouldn’t want you to leave! Plus, you wouldn’t get a promotion in your job in one day!” Kate pointed out, no one could lie to Kate, she had a way of looking people in the eyes, or listening to how they spoke. Annaliar was lying. His eyes were really wide.
Annaliar’s eyes turned fierce, “You! You! You will never, ever see me act nice again!”  he turned to run, but Kate grabbed him.

  “What do you mean I’ll never see you act nice again?  What is wrong with being nice?  And how in the world do you expect to get to Earth? How did you get here?  There aren’t many flying skateboards.” She asked, still trying to figure out who this man was.

Annaliar looked like he was going to explode with anger, “What is it with you and questions? Don’t you know I would rather not tell you about how I got a magical wrist band that allows me to fly!? I don’t want to take my time to tell some little midget how some weird dude dropped it.  And, I don’t need a little threat to try to stop me from getting revenge on that horrible Stete Krown!” he yelled with anger, looking more angrily at Kate. Then, for the first time he seemed to notice something, how she looked. It seemed to catch him off guard. He gulped with fear, and sped off toward Kate’s house.

Kate tried to think. Who was Stete? And why did he share her last name? Who dropped this wrist band that allows you to fly? Why did Annaliar all the sudden look scared of Kate? How was Kate a threat?