If it's a one-off then it's unlikely a red flag will matter. It will either have already been done or will not be done, the flag comes too late to intervene.
> A lot of times the people who have their weapons seized are not having a bad life—they’re having a bad moment.
It's an ex-prosecutor's illustrative hypothetical, so take it for what it's worth. Still the same logic applies if we're talking about bad weeks instead of bad evenings.