Voadam
Legend
Invisibility relies upon sympathetic magic to work (Gum arabic covers the eye blocking vision of you). "attacks" are inconsistent with that sheath of protection. When you make an "attack" you symbolically break out of your protective cover and expose yourself. Other forms of attention getting such as making loud noises, do not break the protective visual shell. The sheath is strong enough to withstand simple actions like rapid movement, but symbolic exposure such as attacks do break it.
How's that?
How's that?