Desmond makes a good argument for Sayid not to kill him at the well

Sayid arrive at the well and points his gun at Desmond. Desmond calmly asks Sayid what he's getting in return for killing him. Sayid tells him that Locke promised him that he can get the woman he loves (Nadia) back who is dead. When Desmond why he thinks Locke can bring her back to life, Sayid tells says that Locke brought him back to life (referring to his resurrection while laying next to the spring in the temple).

Desmond poses a question to Sayid. He asks what he will tell Nadia that he did in order to get her back. This seems to cut through Sayid's zombie-like state, but we don't see what happens next.