I just took a concealed carry class in Oklahoma and it's the same here. They have to brandish a weapon before it's considered a righteous shooting. In fact there was a term the instructor used "reciprocity", which means that a lot of states will uphold the CCW laws of other states and it carries weight through a chain of states from Nevada to Florida.
"September 6, 2005 Missouri Note: Effective immediately, Governor Perry has issued a proclamation that allows persons with concealed handgun licenses from Missouri to legally carry in Texas. Missouri residents will be required to follow Texas law while carrying in this state. This has the effect of reciprocity between Texas and Missouri since Missouri law recognizes valid licenses issued from other states including Texas."
So if I go to Missouri with my TX CHL and I'm carrying a concealed weapon, I have to obey MO laws not TX laws.
Also my FL permit is a Concealed Weapons Permit, therefore, in FL I can carry a deadly weapon, not just a handgun, defined by the FL laws. TX only allows for concealed handgun only, therefore anyone with a FL permit can only carry a concealed handgun in TX.
I hope this helps clarify reciprocity.