If you had no choice but to kill someone, what manner would you hope you’d have to do it?

Say you are in a situation where you had to kill someone else, I am not speaking of murder, but if you were attacked, someone was attacking your family, a botched robbery, a hostage situation, etc. to escape, or keep from being killed if you had to kill the adversary how would you rather do it, kill them with their own rifle, their own pistol, drop weight on them, run them down by vehicle, blow them up in an explosion, light them on fire, push them off deadly height, stab them with a knife, snap their neck or choke them out hand to hand, or pummel them to dead with some sort of bludgeon, which way would you hope and why? Such as you did not have to see the life slip from their eyes, less blood and guts, quick kill as to not have to see them suffer, you can get them from distance, etc.

<small>No, nuclear blast is not an option</small>