Weirdness with lashes of the slave and npc shifters in form

I know npc shifters are done differently than PC ones, but this shouldn't be possible. lashesoftheslave You give a black panther a brutal lashing with a barb tipped cat-o-nine tails to break his will! Your brutal lashing maims a black panther! Your brutal lashing decimates a black panther! As you lash a black panther's paw, he yelps and releases a sheet of vellum with a gold border! Your brutal lashing decimates a black panther! Your brutal lashing devastates a black panther! Your brutal lashing decimates a black panther! A black panther is covered with bleeding wounds.