Here's my idea and I need Iron Man fans to help/debate/ridicule/approve it as my knowledge on Iron Man is good but it is better to consult experts.
Tony Stark is teleported to a room by a mysterious enemy. The room is essentially an electromagnetic room which prevents him from activating the Extremis armour leaving him a normal, vulnerable human.
How long would it take Tony to figure a way out before the door opens and he gets shot in the face?
Any help greatly appreciated