Flavio showed me a great move today. I was almost caught in it by another person training at the gym. It was the “bicep slicer”, which is a pretty ominous sounding name. Definitely one of the nastiest submissions in BJJ. I found a great page with instructions on it, specifically attacking from butterfly guard. One thing I might have added to the instructions, is to open your knee away from you when executing details missing, but the best part was that Flavio showed me how to get out of it! 
It involves, defending the butterfly guard attack, putting your knee on their chest and posturing up, then using your other knee to break their grip. This move is only allowed by black belts, but it is good to know.
Tomorrow I am going to go train boxing. I’m looking forward to that. There is a gym in Porto Alegre that is owned by an American.