- Keep an eye on their hands.
- Attempt to de-escalate the person.
- If they brandish a weapon in extreme close proximity to yourself, use both your hands to firmly grab onto the hand/wrist that's holding the weapon and extend your arms fully (using your skeleton to maintain that distance and provide added strength). Your focus should be on controlling that hand so they don't stab or shoot you. Yes, you may incur injury regardless, this is what's colloquially known as a "shit sandwich".
- Increase distance and vacate the area as soon as possible. If they have a gun, run in a zig zag pattern and seek cover (blocks bullets) or concealment (hides you, but doesn't stop bullets).
- Once you are safe, then report the incident to law enforcement (if they'll do anything).