And you would have been completely justified. In Washington State, justifiable homicide includes the defense of yourself or others wherever you are legally allowed to be.
RCW 9A.16.050
Homicide—By other person—When justifiable.
Homicide is also justifiable when committed either:
(1) In the lawful defense of the slayer, or his or her husband, wife, parent, child, brother, or sister, or of any other person in his or her presence or company, when there is reasonable ground to apprehend a design on the part of the person slain to commit a felony or to do some great personal injury to the slayer or to any such person, and there is imminent danger of such design being accomplished;
or
(2) In the actual resistance of an attempt to commit a felony upon the slayer, in his or her presence, or upon or in a dwelling, or other place of abode, in which he or she is.
There’s the law, and then there’s the law as appropriated by leftist governments. After all, the McCloskey’s in Missouri had every legal right to defend against what they reasonable saw as a threat, and were yet prosecuted by a politically motivated, corrupt city attorney.
There’s probably only one thing missing...the nurse’s desire to carry a gun...and defend herself. Being in Seattle, I’m guessing she’s a Brandon-voter and believes guns are racist. Maybe her attitude has changed now.