It is recommended (IANAL, read this over the internet, but this seems legally sound to me) that if you are involved in an incident of self-defense, one would sa

It is recommended (IANAL, read this over the internet, but this seems legally sound to me) that if you are involved in an incident of self-defense, one would say, “I want to report a ____” and go on to explain the /outcome/ of events to the operator.