Since when is 22p half someones hp? Maybe if they're naked without any str/IF?
and even that would be a stretch.
OK, not half, but 22p, considering speed bonus, will be at least 25% of someones health.
That spike on fauchard is not even long enough to pierce through boiled leather and mail.
And even if you did stab someone in light leather armor, I dont think that it would cause anything else than small puncture wound.