Most people are not used to acting, only observing. It's gotten worst since cellphones, social media and our instant access to video cameras on our phones. People will video something before they'll take action.
To avoid this phenomenon, we tell seminar attendees to think about scenarios and imagine what they'll do. It speeds their reaction in emergencies if they've already "been there", even if virtually.
The three men in this video react in a near instinctive, awesome manner.
The brain's process is:
OODA:
Observe
Orient
Decide
Act
or
ORCA:
Observe
Relay to others
Calm
Act