Lol just like how titans have their blinding grenades AND a blinding bubble when they have that helm equipped! Hunters going invis is their only method of staying alive in hard times, so it's defensive, while at the same time can be used tactically to kill the enemy in pvp or pve it doesnt really matter. If you're good enough you can use it as a surpassed attack in pvp, and even if you don't have glaucoma you won't see it coming