Lamp was empty, and Harry was chosen (role reversal)

Unconscious Harry started to stirr when purple-pinkish smoke shoot out of lamp and started to drag him inside. Love and lust magic used to create this object reacted particularly badly with dark magic in Harry's scar. Squeezed tar like substance out of it.

Hermione were scared and dumbfounded. Without moment of thinking packed lamp to her book bag and run in the direction of castle in the search of help