The radio was set to just above a whisper, so that Bob could hear if there were any nearby groups in trouble, and keep track of monster movements.
There weren't enough Elites around to clear everything before it wandered into someone else's zone, and most of the teams were doing what they had done, and working to eliminate the most dangerous group first.
If that one headed for the nearby villages, they would catch hell from their superiors, and the rewards for eliminating the more powerful groups were the reason most of them were here in the first place.
From what Karl could hear on the radio, most of the ones who had been forced to come out were the lower ranking Elites, the Awakened warrior classes, and they weren't anywhere near where his group had been relocated.