I've seen disturbing reports (see The Mail Online Wednesday July 8th.)) that an armed police officer refused to confront the killer because he wasn't wearing his bullet-proof vest - but surrendered his pistol to a brave young volunteer who chased the gunman but was unable to work the safety or get the semi-auto pistol to fire properly.
There are plenty of thoughts generated by this account - but any instruction to wait for the police must be questioned. - we must get a more detailed report but it seems that it took another 20 minutes with 38 dead before vest wearing officers ended the shooting.
When maniac Anders Breivic dressed as a police officer in Norway and killed 77 young people in 2011, many delays were caused by police mistakes - but one tragic part of his attack was that there were several instances of the young people not trying to escape - indeed one group lay down on the path hoping that this killer would not shoot them if they played dead when he walked-up. - He shot them all - but some lived to tell how they had thought it was a good idea not to resist.
Breivic (No Death Penalty)
Reference: ' One of Us' by Asne Seirstad - the story of the Norway massacre.