Actually, so is Osama. He'd be the center of worldwide attention and the focus of terrorist stunts for years to come. Capture is the best possible career move he could make. I anticipate his early surrender to US armed forces (not the Northern Alliance).
In which case the correct response would be:
Scene: the Afghanistan mountains. An army Lieutennant is on the phone.
Lieutennant Captain? We've gone one Osama bin Laden here. He says he's a fugitive from United States Justice and he wants to turn himself in and stand trial. (listens) What? Of course we disarmed him. We disarm all unfriendlies, you know that. (listens) OK, sir, if you say so.
(Scene expands to show Osama bin Laden standing between two guards. Lieutennant addresses Osama.)
Lieutennant Mr. bin Laden, I understand you have an official pardon from the President of the United States. We'll have to keep your weapons and your vehicle, but you are free to go. Have a nice day.