Ron Borsch of the SEALE Academy (Southeast Area Law Enforcement Academy) in Bedford, Ohio has done some outstanding research on single responders cutting short mass murder incidents, as noted early in this thread.
An interview with him on the topic has now been posted at ProArms Podcasts. These can be downloaded to your computer or iPod at http://proarms.podbean.com
, or at iTunes or Zune. The Borsch interview is on Episode 27.
Best wishes to all,