Sarkazein

Hi all, new to the series here, and I must say I love GF4. Anyways, I was kinda sad that Greenfang was scripted to go evil on me, forcing me to kill him after all my hard work keeping him alive (you know, during the boss fight with his former master). Anyhows, after much reloading and trying of different tactics, I was able to save him! So, my question is twofold: did I break the game? Am I supposed to be able to keep Greenfang? Thanks! And two: What are my chances of keeping him alive for the rest of the game? From what I can glean from the rest of the forums, the later chapters can get pretty crazy.