I made a mistake and captured an enemy unit - I could have moved so that it would have been eliminated for failure to rout, but I didn't. So now a guard HS guards a prison full squad and can't shoot, but might have to.
If I let the prisoners go, they become Good Order and count for my opponents VC. Worse, there are a lot of SW scattered around. If they pick up a machine gun and start firing at me, I'm still not allowed to fight back without risking the Massacre penalties, right? A bad situation...