From the top of Mandalay Hotel open fired during a music festival. The shooter had two divorces and a son of a bank robber so this was a social encounter from his surroundings.  The scale of pain that I would use is 9 with the mass scale of the event. 

http://www.npl.international/uploads/3/4/9/6/34966829/2017_las_vegas_shooting.pdf

geog203