They had to count the number of cameras in the forest, not just the number of cameras on their routes. They had to know the topography of the forest, then pass the cameras, and understand their layouts, in order to calculate how many cameras exist around that area and where the next one would be installed.
It was not only a test of observation but professional knowledge too.
Not only did they need to know the number of cameras, but they also needed to avoid them, to prevent the soldiers from discovering them. Even movement amongst the bushes had to be controlled.
"Dual cross-type camera, ABCD connection. Little Fox, there should be a spot-type camera over at your side. It's worthy of the army's best chemical defense regiment. Even the distribution of the cameras gives me a headache."