Either that or the reverse.
I could be using a scrimshaw knife to carve scrimshaw. However a scrimshaw knife can be seen as a dangerous combat knife. Regardless of my intended usage of the scrimshaw knife, I can expect the possibility of someone being terrified. Since I am not able to control that reaction, I don't scrimshaw in public.
(I don't scrimshaw in private either, nor do I own a scrimshaw knife. Examples are sometimes just examples.)