VixTD, on 2014-April-08, 07:58, said:
Specifically mentioning the diamond that's out suggests he's planning on taking it with the higher diamond spot, which implies he is going to throw the spade.
He has two higher diamonds in each hand. Since there's only one low diamond out, he only need one of them to pick it up, so he can obviously afford to discard a diamond. The way he made the claim sounds to me like he's effectively saying "I'll draw the last trump, lead a diamond to dummy to take your diamond, and then the spade to take your lower spade spot."
If he's going to throw the spade, the opponent's spade is irrelevant.