Now this is interesting. I got an extra attack from dancing blade:
You punch the hunter, throwing the whole weight of your body behind it and dealing 20 damage.
The hunter draws his gun in a blur and takes a single quick shot dealing 1 damage.
You slide past the hunter, leaving a vicious cut for 28 damage, but golden light weighs down your attack, preventing all but 17 damage.
The hunter opens his third eye, bathing the area in golden light.
Your blade continues to attack, seemingly of its own volition, cutting into the hunter for 36 damage.
The hunter pumps his remaining rounds into you, dealing 2 damage.
with dancing blade as a chain ender, and quivering blade equipped (does it work with other swords? weapons?) (My attack was 19, 21, ??; sadly the defense of the hunter isn't known)
Tested it again; the power of the extra attack is between 6 and 9.