The soldiers from the Star of Dawn panicked a little bit as the passageway turned dark. Even though they were trained soldiers and had been in numerous life and death situations the sudden darkness still had some effect on them. Even with all their training and equipment, they could not completely erase their primal fear of darkness.
"Switch to night vision."
The commander ordered his men and though still a little unnerved the soldiers responded to the order. Once they had activated their night vision the soldiers got into a tighter formation their guns pointed at the two ends of the passageway.
The passageway then became eerily quiet, as the soldiers steadily held their positions. Even after switching to night vision, they were not able to spot the enemy.