So, when an event occurs, that causes a large group of people to pass into spirit? What is actually happening is this:

In the process of a spirits choosing its body and its life? The spirit will pre-eniginer at least three exit or death points. Sometimes multiple spirits will choose to exit in a group event.

This can be a plane crash or a ship sinking or a terrorist event or a natural disaster. This agreement will resolve past karma more rapidly for these spirits. However the shock of finding ones self out of body and still aware is very tough to deal with.

Often these spirits need escorts and counseling to assist in their transition.