If you think that a knife threat should never call for a firearm response then I recommend this video.
<a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=2xpcrDzy344" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=2xpcrDzy344</a>