Read about this earlier, it's crazy how he's just gone all of a sudden, but I think I can understand it somewhat though after reading through their website.
Actually remember having alittle chat with him one day back around 2005~2006, we had a nice chat about coming up with combination weapons. Turned out he had the idea of Crescent Rose even all the way back then. I was really surprised at the time when he mentioned using the weapon's kickback, where my idea was a shotgun using the concepts from a M16 to reduce the kickback letting the user swing it around and shoot without too much knockback. Found it kinda funny how we had different ideas of how to deal with kickback, embracing or eliminating it.
I really do want to continue and create the game that weapon idea of mine would show up in, but I still have some ways to go before I can do that, yet.