There's no particular shortage of otherwise good folks who have ended up incarcerated because they thought they were doing "the right thing", but then discovered that a prosecutor and jury disagreed. Nobody wants to be that person, right?

If you're going to risk your safety, freedom and the financial future of yourself and your family in order to come to the aid of what you think is an innocent third person ... and you somehow think that just because you're lawfully armed that your gun is going to be, or is supposed to be, part of the solution ... you might wish to have a proper lay person's grasp of the laws in your state (or whatever state it is you're visiting).

If you're not a cop, it might be unwise to try and act like one.

If you don't have the training and experiential knowledge needed to safely intervene in some fight or multi-person brawl, and decide whether it's even prudent, are you just going to guess about it? Hope that you're right?

While the word "reasonable" is found in the court room, it's usually carefully defined within the statutes involved, and applied to any given situation by considering the context. Sometimes a judge will end up defining "reasonable" and explaining how may be applied.

On the other hand, trying to apply the term "common sense" may not be as successful as you might hope inside a court room.

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Ret LE Firearms inst & armorer