There is NO excuse for not calling 999 right away. Perhaps a member of the public could potentially say that they assumed Park staff/someone else must have called, but trained first responders or not, a roller coaster crash is a 999 emergency.
I've called emergency services myself many times at work and so have customers for the same thing. They always treat every call seriously at first and within seconds of briefly ascertaining the issue, they've dispatched the nearest available unit. This is regardless of who calls and they normally keep you on the line until a unit arrives to get as much info as they can.
If anyone had just dialled that number quicker, the air ambulance would have been there earlier and this could well have been the difference between life and death.
I personally feel horrified and disgusted that so many people had a device in their hands capable of calling 999, but instead pressed the camera button and used it to film the carnage instead. It's absolutely shameful and I struggle to understand the mentality behind it.
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