The caravan merchantLucky Harith has been known to pass near this area and might get into a fight with the mutants that spawn here. If you haven't previously cleared the area in and around the church of mutants, he and his party will get killed. If you clear the area first, the only mutants that he'll have to worry about are the 1-2 that respawn, which he and his bodyguard should be able to handle.
If returning here after several game days have passed, you will more than likely be attacked from multiple directions by the mutants. Fast traveling to a nearby location is advised instead, as to avoid the massive firefight that would ensue.
Near this location, you may find a pack of vicious dogs (3-5), as well as an occasional robobrain.
South-southeast of this area is a large stone bridge that leads to the smaller bridge to Big Town. Near the shore of the water next to the bridge is a small raider outpost with 3 raiders who respawn every few in-game days.
You may encounter a dead wastelander next to the captive who, curiously, is still blinking.
Hallowed Moors Cemetery appears only in Fallout 3.
ps3 Sometimes you won't be able to free the captive due to the game telling you you are in combat even when all enemies are slain. Fast traveling to a nearby location and walking back usually fixes this.