Somewhat more seriously, I have heard of shields being described as defensive weapons, as well as (theoretically) nonlethal "personal security devices" such as tasers, pepper spray, and so on. So it's possible that 'offensive weapon' is something that would normally be potentially fatal if used as a weapon, as opposed to things that can hurt someone but usually won't kill them unless they have some condition that makes them especially susceptible or you take it to an extreme.
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@Sunwyn A really, really polite gun?
Somewhat more seriously, I have heard of shields being described as defensive weapons, as well as (theoretically) nonlethal "personal security devices" such as tasers, pepper spray, and so on. So it's possible that 'offensive weapon' is something that would normally be potentially fatal if used as a weapon, as opposed to things that can hurt someone but usually won't kill them unless they have some condition that makes them especially susceptible or you take it to an extreme.