The Marines were seated one by one, side by side, in the vehicle that in a way delivered them to the capture. The Marines just felt to defeated with no option to fight back.
Once they're seated with their hands still ziptied behind their backs, their feet are taped together. To add to the humiliation, their mouth are taped shut, and blindfolded. They did not want them to communicate with each other, or know where they're being taken to.