Angry that Zatanna, a mere person of magic called upon him....."Witch! Thou darest to summon me, to speak my name! Foolish child, so unwise to play this game!"

He is being very sarcastic here and taunting her in a way....."Through broken truths and lies like glass, my eyes have ne'er seen this lass. Adder's fork and blind worm's sting, of your name I know nothing."

Intrigued by Zatanna and her questions so decides to play along but still being a bit aloof about what he and who he does know...."Well then...listen thou closely...I'll not repeat...there are rules and laws that even I cannot defeat."