[Kameron8]

The fist weapon special attack, Fox Dive, can incorrectly be used with any weapon when a character uses the Mixed Martial Arts ability. To replicate:

1. Equip Martial Artist, with points put into the Mixed Martial Arts ability.
   
2. Equip a weapon (non fist) in the main hand, and nothing in the offhand, so that you qualify for Mixed Martial Arts.
   
3. Get into combat, and use the available Fox Dive skill to use the attack with your non-fist weapon.
   

[Noxid]

This is true of all of the verglas special basics. You don't need MMA actually. Whatever you main weapon is it will allow it.

[Neus]

This has been corrected in 2.24. Note that these skills will only work if you have a Fist in your mainhand or have no weapon equipped, as they are intended to only use your main weapon.