Blink strike is not a one hit kill only if you have a perk and you are behind the enemy with that perk. You get no armor while in GG. GG doesn't have auto aim btw and is the only super that actually requires good aim. Arc blade last 10 seconds you can increase this with the perk that extends it when you get kills but at the trade off of health regen. This is not a thing with Titans btw they have 2x as much time without added perks. Etc
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You saying that GG requires good aim further proves my point that you are a dumb hunter. Nova bomb takes some REAL aim to be good because it hits everything that sticks out of a wall and you have to account for gravity. Also, you don't have to be behind someone for backstab to occur. It triggers behind and from the sides as well. You have a chance of getting a one hit melee without your melee charged, even if they are facing you, I got it to work twice yesterday when I was using on my hunter.