Mine would b to lock him in a room containing stagnant water left for two weeks to breed mosquitoes in this heat season..Then i will make him naked and tie him such that he cannot move leaving him for three days.
let mosquitoes do the rest of the job

Therefore?,

I will let him go. what else?

He should shout sai baba in the middle of oshodi market

stabbing the him/her with both Blades of Exile, wrenching out pieces of flesh as they are removed, As the victim tries to stop the bleeding, i will draw the Blade of Olympus and drives it through their chest, using it to pin him/her to a wall or ground, then finally leaving him or her to bleed to death... So i didn't kill him, he died himself by bleeding to death