If 30 gunmen did open fire on them, they were probably dead before tortured. That's my hope at least, and I'm sure the hope of the families involved as well.
As I will point out...and others have done so in the past...the amount of ammo these guys are carrying isn't exactly alot. If they did have extra ammo...it lay in the HUMV and by moving back...they gave up their chance of survival at that point. As long as you can keep firing...no one is going to advance on you...the minute you run out of bullets...your chances of survival end. That is the sad end of this story.