It's actually much more complex. Let's look at "bannerfall" First two letters? Ba. That's the sound a sheep makes. "Ba ba black sheep, have you any wool?" Not Nearly Enough. "R" sounds very much like the sound a pirate makes. Arrrrrrr! Fall is self explanatory. It comes after Summer and before Winter. The biggest Destiny updates are released in the Fall, and the next big "update" will be Destiny 2. So, Destiny 2 will be released in the fall, and the main antagonist will be a woolly space pirate.