Forum:Gorz The Emissary of Darkness

The other day me and my friend were having a duel. I attacked my friend directly with a Dark Magician and he had no cards in control, he then special summoned Gorz The Emissary of Darkness. He activated this effect; Effect Damage: Inflict damage to your opponent equal to the damage you took. At the time he had 300 life points, does this effect mean that he takes the damage that I dealt with my Dark Magician then he inflicts the damage that I dealt him.

Thank you in advance to anyone that replies!