I just watched the video.
Plain and simple, the armored humvee escorting truck one and five abandoned them! At the very least, the humvee could have picked up the survivors from truck one and five. Shoot, they just hit the gas and got out of there!
Whatever happened to showing a bit of bravery? Bravery is doing the right thing even though you are scared.
But why would someone be terrified, sitting in an armored humvee, protected by a gun shield, wearing a kevlar helmet and body armor, with an M2 machine gun and hundreds of rounds of ammunition? Only thing that could have penetrated that humvee would be RPGs and rounds bigger than 7.62mm.
I think this is a case of inexperienced, scared troops, and perhaps very poor tactics. Heres what I think should have been done: The humvee stops, the gunner suppresses the insurgents, the driver runs out and gathers up the civilian contractors. Wouldn't have taken more than 45 seconds.