Hell, they are probably working together to merge the two universes. When Sylvanas went all "this will change everything" when she first saw Azerite is because Azerite showed her a way to use it to open a portal to Westeros so that she can summon the Iron Fleet to Azeroth to win the war for her. After 8.2 any Alliance attack will be thwarted by Euron popping out of nowhere and sniping them with his railguns.
At this point (and by "this point" I mean at least since the second half of season 7 with Gendry the marathon man) you could throw alphabet noodles on a piece of paper and whatever mess you'd get would still be smarter than what D&D are doing.
The railguns' projectiles have homing, just like the ice spear Night King used to kill Viserion last season.