Board Thread:Questions and Answers/@comment-173.24.147.12-20131103194042/@comment-67.204.209.92-20150706064624

or he went into armor lock, it happens in the later seasons, when someone goes into armor lock they, or more rather their armor (as spartan soldiers are pretty much neurologically connected to their armor) continues communication with all electronic devices in the area, computers with AI still broadcasting as always. As such, Sarge after being shot in the head was actually saved by armor lock, his armor shut down to protect him as his team performed what is likely the worst medical treatment ever and probably started to repair him before he could die. Also, while in armor lock his unoncious (or, if he was out more than 5 mins, comatose) mind was transfered into his armor to avoid having to deal with the pain and had a conversation with the computer programs around him