Oblivion - Mjolnir Senses

Three minutes into the thicket, John’s motion detector showed a line of five UNKNOWN designators fidgeting a few meters to the right side of the trail. One designator was about three meters behind the middle trio, serving as a rear stop, and another was three meters ahead, serving as the front stop.

The five ambushers were so well camouflaged that as John passed by, he could not see any of them with nonenhanced vision—though he was careful not to take an obvious look. He simply continued forward until he saw the first marine draw even with the rear stop. Then John shouldered his BR55, spun toward the alien in the front-stop position, and spoke over SQUADCOM.

- Halo: Oblivion, Chapter 21