Watched and have been thinking about the lake battle. It either lends some real credence to the Bran=NK theory (or is at least connected with NK in ways he is currently unaware that inadvertently benefit NK), or is just awful lazy writing
There are several aspects of the fight that suggest it was pre-meditated.
First, I have a feeling that that small party that the Expendables came upon were bait. There was one... something... and this is kinda tangential but more bad writing: the wights died when their master white walker died, except that one, who surely doesn't have the appearance of the white walkers we have come to know. Anyway was it planted there as a signal to the rest of the army?
When they were running, they hit the ice and immediately we see it was only partially frozen... as if it were recently un-frozen... which would allow:
The chains that dragged up the dragon appear to be pre-placed, as when they pull it out, the chains have to come up through the re-frozen lake. They were down there before the lake re-froze.
NK and his bros show up the next morning, which I mean I guess could make sense if they want to just chill and watch Jon and Co. slowly get overrun, but there's no real need for him to be there, unless...
They knew the dragons were coming, given they showed up not with their typical unique weapons, but new, yet-to-be-revealed spears. Three of them. When Dany shows up and burns paths through his army seemingly out of nowhere, there is no shot of any surprise from NK. If NK is linked to Bran and can see what Bran sees, could he have become aware of the raven to Danny thing?
Side note, if NK stuck around to raise Viscerion, why didn't he stick around to raise Jon, whom he just watched get tackled into the freezing water...?!?!
It also just struck me; has Bran been the Lord of Light too all along? Whispers and visions led to Arys' madness and burning people, could it have something to do with the visions Mel, Hound, etc. have been seeing that have driven a large portion of the plot?