When I first read the description on Auriel's bow, I did not take the meaning literally. And just joking around, I tried to shoot a bloodcursed arrow in the sky, but nothing happened, as I expected.
And then a couple of days later, I started growing tired of Serana's constant complaining about her complexion, and I had one of those moments of frustration, where I just whipped out the bow and shot a blood cursed arrow in the sky at random, just to show her that there was not a gods damn thing I could do about it......but then it happened. The most wonderful experience I have ever witnessed. And it only gets better when you go into town or you're around people

My goodness, how I love this game!