Q 492

Another Battlemind question...
If I use Lodestone Lure on Target A, but there's a Target B on the RAW pull path between myself and them (assuming I'm using the augment 2), if I can't technically move them all 4 squares (because an enemy is between us and forced movement can't place enemies in a place they wouldn't move normally), can I use the attack? The "must" move effect of the attack has me a bit confused about what to do when something prevents me from completing the Pull action.