As in previous Souls games, Patches will try and trick the player into dying, in the aim of looting their bodies afterward.
When found in the Cathedral of the Deep, Patches will be disguised as Siegward of Catarina, standing next to a bridge. Going halfway between, Patches will lower it in an attempt to have the giants kill the player. If the player has already killed both giants, he will scold them for doing so. He will appear back at Firelink Shrine on the upper right floor starting from the entrance. If the player refuses to forgive him, he will reward them with a Rusted Gold Coin and become a merchant.