This is a remarkable article and it is clear 'the doc' is a remarkable man. 

One thing confuses me though. The article states: "As he recalls, the soldiers gave him bare-bones biographical data on the casualty: The fighter had killed Speer. He was a Canadian who had been Osama bin Laden’s “houseboy.” They also told him to keep the high-value detainee alive because he would be a vital source of information and passed him off." Mr. Khadr was severely injured. How did the soldiers know that he was Canadian?