That is not how I interpreted the OP's question. He was talking about taking the shift and slide on the next turn and dealing the extra damage at that point.

I can see an argument for being able to claim the damage when you slide them. Since all of these are interactions within the same power, order becomes important. And because one of the effects only happens when wielding a particular weapon, the order it was written in got all screwed up. If a DM said that they wanted the slide to trigger the extra damage, I'd be fine with it. But I feel that my post better aligns with the intent of the power. Yes, I know this isn't the place to bring up intent, but I think if either reading is equally valid (which I think they are) then intent can be considered.