When stuck on an attraction, when is it okay to call 911

There’s a story in the Orlando Sentinel this morning about a ride-stop and subsequent guest evacuation on the new Harry Potter and the Forbidden Journey attraction at Universal Orlando’s Islands of Adventure park. Ride-stops and walk-offs happen all the time at theme parks, particularly with new attractions, so this wouldn’t be a story, except for a this time a guest called 911

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When stuck on an attraction, when is it okay to call 911