Hi,
Unarmed Strike is not a "natural Weapon". Its a set of fist, elbows, feet, martial art technic in somme sort.
RAW "A monk' unarmed strike is treated as both a manufactured weapon and natural weapon FOR THE PURPOSE OF SPELL AND EFFECTS THAT..."
So... its a Unarmed Strike. A named hability/power. Name it differently if you whant.. But that power is excluded by the rules of Imp Nat Weapon.
PS: sorry for my poor english. Im a french guy!
