It was not murder, since murder means killing illegally
You could have picked from so many different reasons to why this was not murder, but this one takes the cake.
I have another one!
Murder is a crime, and Criminals are in Jail.
Since he is not, it could not have been murder! CHECKMATE LIBERALS /s
Violent bloodthirsty evil thug, then. Is that better for you, Herr Pedant?
Orchestrating a scenario in which the only possible outcome is self-defense by deadly force sounds an awful lot like premeditated murder, to me. I think you should reevaluate what you consider pedantry.