Forum:Divine wrath vs exiled force

At school, I saw my friend (A) using his incomplete Flamvell assualt deck, and my other friend (B). So, "A" summons Flamvell Magician, and "B" uses Exiled Force to destroy it, and "A" uses Divine Wrath to negate the effect. But, I was wondering that DW wont work since EF is already in the graveyard. I told "A" that it might wont work, but he says it just negates it. Am I wrong about this?