[RedBloodedAmerican]

He was being interviewed by the CIA agent when the Taliban came into the room in the prison. Do you think the taliban, in taking the prison, kept their fellow taliban tied up?

[Semper]

From the news accounts I have read, it is very likely that Walker was still tied up when the attack took place. It may be possible that Walker was somehow involved but that is not what current information reveals. The surviving CIA agent "Dave" knew who Walker was and he saw the attack. He has not linked Walker to the attack.