Really good read with two major flaws.
The first; it never explains how to pull guard onto molten lava. I feel that after reading the entire book if ever I am in a position where pulling guard onto molten lava is my only option of winning - I will be at a loss.
The second; everyone in my work office now believes I have lost a portion of my sanity. Every minute or so I'd stifle a chuckle or snicker which could earn me the nickname 'Muttly' in the future. When asked why I was laughing I ignored the books warning about explaining BJJ to people who don't and said 'I'm trying to learn how to avoid molten lava in a street fight.' and was promptly met with equally confused looks and slow backing away.