Castle doctrine allows you to shoot and take deadly action without retreating In your own house. Basically if an intruder is in your house...he can be gunned downed and you're perfectly in the right...even if he doesn't have a weapon.
That doesn't stand in public, at least it doesn't in Ohio
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Not only does it stand in public, it stands in public if it happens defending someone else being attacked, as long as it's a good shoot (legal under the law). In Pa, you could always defend yourself in your home - this applies to carrying.