He has a script scrypt where he provides r, s, z and nonce and gets the privatekey. So he is doing some basic arithmetics to calculate private key. That's why he begs you to explain how you found the nonce in your script. That's why he asks for the nonce, despite the fact it is just simple math.

Probably tomorrow he wants to sell his script like you wanted. But in fact it does nothing out of the ordinary.