Your first priority should be to heal the three wounded individuals near the entrance to the camp. This is the Shrine of Amadia.There are a few things that you will be able to do here: There is no way to both open the chest and save them as far as I know. The heads themselves actually explode when you open the chest. Moving the bulbs will simply prevent an annoyance for yourself. Unfortunately the only method of saving the heads is to not open the chest. Once you do this you should be able to open the chest with no concern. You should group them by their element so that they don’t cause any sort of explosion loop. The other, much more time consuming method, is to teleport all of the bulbs away from the area.
You should speak with the heads to find out exactly what is going on. There are several severed heads surrounding a chest with a bunch of incinerated corpses and dead magisters littering the area. This is one of the more amusing situations in the Hollow Marsh.