Parkland Deputy Told Cops to Stay Away During Shooting

[MichMary]

4. Here is a link to a 60-page document regarding

what the police response to an active shooter situation SHOULD be:

http://www.policeforum.org/assets/docs/Critical_Issues_Series/the%20police%20response%20to%20active%20shooter%20incidents%202014.pdf

Columbine brought about a sea change in police
tactics. “Contain and negotiate” may be appropriate
for hostage incidents or situations where a person is
barricaded in a room and unable to harm victims.
But it is not appropriate for active shooter incidents.
Columbine resulted in new approaches in which
patrol officers are being trained to respond to active
shooters as quickly as possible.

This is from the article posted in the OP:

BSO policy calls for deputies to engage an active shooter and eliminate the threat.

The bottom line here is that the guy didn't do his job. Whether he could have saved any lives isn't known, but what is known is that he never even tried.