You mean the highly trained, off duty military police officer Katia da Silva Sastre waiting on her children to come out?
http://www.foxnews.com/world/2018/0...-robber-at-mothers-day-event-near-school.html
Yep, she did not maintain any situational awareness after the shooting started and became threat focused as briandg indicated.
As for the lack of situational awareness happening to everyone, I have managed to make more than one firearms instructor mad who claimed to always be in condition yellow, head on a swivel. My favorite was debunking D*** B***** while at a Subway sandwich shop as he was telling two other students about how he had a 6th sense about what was going on around him as I stood behind him making stabbing motions.
You can be assured that when some of these purportedly high speed low drag folks tell you how good they are at maintaining situational awareness all the time that they are flat out lying or are self deceived at how good they are. We all have our comfort zones and we all have problems with fixation. Lack of situational awareness does happen to everyone.