User blog comment:Thailog/Ep. 207 "Depths" discussion/@comment-3003805-20120612194633/@comment-5001598-20120612220346

They probably try to stop it but in the original timestream (the one without impulse in the present) they failed because they tripped up or something to that effect but now that impulse has time traveled to the past we are on a divergent parallel timestream with many many quantam paradoxical headaches happening. So with that in mind Impulse is probebly going to let something slip that Nightwing or someone else picks up on and corrects the mistakes of the first timestream that caused that dystopian future.

If you think this is confusing try watching Doctor Who its full of Timey Wimey paradoxical headaches and cunundrums :)