RG:  ..."... A struggle followed, and the woman and her friend forced Nielsen out the front door and locked him out...." ... key turning point here. the guy was so worked up...meth? or just ill, he very well could have terrorized, these folks,  or worse, while waiting for the cops. 
  i feel bad for the cops., you gotta think a tiny piece of them dies when involved in one of these suicide by cop situations. They must absolutely dread those calls - worse than domestic calls
  it's become almost common, they need a chess master/ pro negotiator. .if you can think 5 moves ahead, maybe you can set things up in your favor and slant them your way. a negotiator who can empathize, paraphrase what she/he thinks is being said by the stressed person, and ask questions like you really care. REALLY CARE.  perhaps an approach as soft as that would cool these folks down to where they put the weapon down.

 the counselor with mr Babb , 2016,  had some success, wonder what she talked about with him .