Although the water isn't very deep, it is very dark, and between the other bodies and top layer of debris, Brenn is able to 'disappear'.
She can feel small surges in the water as the men look for her, and very soft popping sounds as the pistoleer randomly shoots.
Soon, the silvery-white flashes of light on the surface grow smaller until they fade, leaving Brenn in total darkness.
Half dead, soaked in sewer waste, and alone without phone or lights, she finally finds the grate that leads to...
End Scene. Nice work, feel free to start a new one.