As the OP said... it has to be obvious what is going on is an illegal act.
With that said, if I didn't see the fracas start, how do I know who is the aggressor and who is the defender? That guy punching out the woman in the parking lot -- is this a violent domestic? Or did she just threaten him with a weapon? That woman on the ground screaming and the guy ripping her pants off -- rape? Or a snake in her pants? (Happened at a camp-out once). Sometimes you just can't tell what's going on.
Intervention doesn't always require a weapon. A loud shout or command may defuse it - or cause the perp to run off.
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BillCA in CA (Unfortunately)
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