I'm done checking with the other armor types, found another wrong-arm-incident, did some minor pixel changes, so I hope that this is the final version.
As for the UFOpaedia image, Chiko's original picture should be fine for that. My rough draft for the text follows:
-----begin UFOpaedia text-----
This knife is built for close combat. Using its hardened edge and point, a trained field operative can silently kill a lightly-armored enemy with a single slash or thrust.
----- end UFOpaedia text -----
that being said, would it be possible to have different chances for reaction-fire, depending on the weapon used? not reaction fire by the attacked unit, but by onlooking aliens, of course. It would be nice to truly make this a "silent" weapon, perhaps drastically decreasing the chance for reaction fire unless the nearby alien is looking directly at the knife-wielder.