https://revisor.mo.gov/main/OneSecti...&bid=33874&hl=
https://revisor.mo.gov/main/OneSecti...&bid=29703&hl=*571.030. Unlawful use of weapons — exceptions — penalties. — 1. A person commits the offense of unlawful use of weapons, except as otherwise provided by sections 571.101 to 571.121, if he or she knowingly:
(1) Carries concealed upon or about his or her person a knife, a firearm, a blackjack or any other weapon readily capable of lethal use into any area where firearms are restricted under section 571.107; or
(2) Sets a spring gun; or
(3) Discharges or shoots a firearm into a dwelling house, a railroad train, boat, aircraft, or motor vehicle as defined in section 302.010, or any building or structure used for the assembling of people; or
(4) Exhibits, in the presence of one or more persons, any weapon readily capable of lethal use in an angry or threatening manner; or
So, your post made me curious. I've linked the two statutes that seem relevant. Missouri is now a constitutional carry state, so they don't need a permit, but on first impression, it sure looks like it (the actions of husband and wife) could fit into Section 1 (4) of 571.030. Unlawful use of weapons - Exhibits, in the presence of one or more persons, any weapon readily capable of lethal use in an angry or threatening manner But then look at 571.037, above.571.037. Open display of firearm permitted, when. — Any person who has a valid concealed carry endorsement issued prior to August 28, 2013, or a valid concealed carry permit, and who is lawfully carrying a firearm in a concealed manner, may briefly and openly display the firearm to the ordinary sight of another person, unless the firearm is intentionally displayed in an angry or threatening manner, not in necessary self defense.
With the caveat that it is all very fact sensitive, and I don't have all of the facts, here's what I see. Based on the above statutory language, AND assuming a that reasonable person standard would find their display was in necessary self defense (I think it would) I don't see that a felony was committed. Which felonies are you thinking of? It's good for us all to be aware of the consequences of our choices. It would nice to not have to be burdened by the fear that protecting oneself can also subject one to criminal or civil liability, but it can, and often (in less forgiving jurisdictions) does.
Best,
Hieronymous