Give the guy a break, he was excited that he was getting to try something new. I think the arguments that he had some kind of responsibility to the community to press bungie for info are also weak. Bungie just picked a popular streamer to run through a new mode with them for a preview. It was never promised that it would be a comprehensive and full explanation of every aspect of the mode. Also, don't you want to discover anything for yourself? I killed the stream about halfway through as I wanted to keep some of it for when I run through with my friends.