To set an ambush for the enemy, it isn't necessary to have a clear grasp of their movements, but it is certainly very helpful.
It seemed as if the enemy was advancing along the trail left by Gao Yuan and his team, but it was unclear how they were doing it. However, tracking them wouldn't be difficult because there would always be traces along the way. As long as there were skilled trackers, finding the way wouldn't be hard.
Gao Yuan watched from the tree as several people slowly searched and advanced, but the enemy's speed was somewhat too slow. Even though Spark Squad was on foot, considering the enemy's pace, there didn't seem any risk of being caught up to.
Because one must ascertain the direction before they can take advantage of speed. If the direction is wrong, wouldn't faster speed mean straying farther away?
So Gao Yuan didn't quite understand what exactly the enemy was doing.