Drive around somewhere else on the map. There are small quartz deposits all over the map that aren't surrounded by enemies. Besides that if you have a vehicle you can easily kill all enemies. Drive vehicle at enemies very fast, hop out of vehicle and it will hit the enemy and make them rag-doll around and give you a few short seconds to melee kill it before it "Wakes up". Then hop in vehicle, drive away and come back and repeat until it dies. You can't be hurt while in vehicles so just do it repeatedly.