"Tear gas would not prevent them from hiding behind the obstacles and crawling around. How about I start with those in front of the cabin, Richard starts with those around the campfire, Bart takes the others, one by one, and you scatter a quick series of three flashbangs around the whole camp, then stand ready with explosive grenades to target those who succeed diving for cover?"
SpoilerBasically, proposing Tariq to reload with 3 flashbangs and 3 frags, then, when everyone shoots, spend a second to launch the flashbangs at the center of the camp with some deliberately reduced skill to have all three shots scatter in different semi-random directions. They affect a radius of 10, thus a diameter of 20, thus with the campsite being 25 yards on the side, we should have good coverage.