The Truth Provider
This is the QA review of that event by city EMS's medical director, released by city's public safety director. Recommended read for all interested.
Accessed via http://roguemedic.blogspot.com/
This was a failure by everyone based on that. But based on that the Paramedics did not cancel rather the caller did. The Paramedics also had no knowledge based on this of the other calls and were told caller cancelled so they were not given reason to pursue a rescue attempt.