The "surrendering" Talibs from Kunduz knew the old fort very well, and knew that if it could be taken from inside, they would be able to stage a long and bloody siege, an "Alamo", on their way to meeting allah.
They got their wish.
You'd think the two of them would have had additional (NA) security with them on the inside amongst hundreds of belligerent prisoners who had already proven (the night before) that they had some weapons and were willing to commit suicide to take others out.
I'd think there was more to the story of how it went down with "Mike" ... but then again, perhpas not.
Either way, he was an American who died at the hands of these animals in the line of duty. God rest hi soul and God bless his family.