Deadly force is deadly force, and at least in Ohio, it's lawful (with certain caveats) to respond to ANY form of deadly force with ANY form of deadly force.
- Attack me with a tire tool and I shoot you.
- Attack me with a knife and I shoot you.
- Attack me with a gun and I shoot you.
Don't like that? Don't ATTACK me.
In Ohio, if outside of home or vehicle, I must ATTEMPT to retreat IF (and ONLY if) I can do so in PERFECT SAFETY. I don't have to turn my back on my assailant and try to outrun him. I merely need to make a REASONABLE effort to disengage. If he thwarts that effort, the responsibility is HIS.
Likewise, I must stop the use of deadly force when my assailant is no longer a threat. Once he's on the ground and incapacitated, I may NOT continue to shoot him, much less reload and continue to shoot him.