OCC
Oh he knows it. And if she shuts him down, humiliations galore.
Not expecting her to throw herself at him on stage. I assume they go to the backstage when song is over.
She wasn't expected to do a long set, they may have been getting ready to end, and that became the encore.
Also, it frees everything up when over. Even Nixie, who will pay more attention then. Or Bastian, who I am sure was watching Kyle at least at first