she is not a security guard nor a police officer. she could have done any number of other things than that.
You have to be an agent of govt or hired goon to stop a criminal now? Wow!
In the state of Washington, a regular person has greater leeway in the use of deadly force than a police officer. However, shooting at a fleeing felon is usually reserved for a violent felony, or hint of violence (like “give me the cash - I have a gun”).
Legislative recognition: “The legislature recognizes that RCW 9A.16.040 establishes a dual standard with respect to the use of deadly force by peace officers and private citizens, and further recognizes that private citizens’ permissible use of deadly force under the authority of RCW 9.01.200, 9A.16.020, or 9A.16.050 is not restricted and remains broader than the limitations imposed on peace officers.” [1986 c 209 § 3.]
Of course, this woman may have heard something else perceived as a threat, and saw the guy reaching into his pocket, etc.