So I was doing the nightfall with my two friends and we were at the end of sepiks prime. When he was dead we were all celebrating after that long 30 mins, when my destiny froze, and my friend told me I had departed. I was very annoyed, so I went to do it again on the same warlock, as I got no rewards or proof that I had even done it. But when I completed it, I got no rewards or any reputation, as if I had already done it. What is this?