The Blind Skill reduces the monsters sight radius by 20% per point, so even if you have 4 points in, the monster can still see you if you close to melee range. I don't know why the enemy is attacking you if you're using Rank 5 Blind. Rank 5 blind certainly works on the player! Alternatively, use it on (ranged) enemy A, and go attack enemy B instead.
The Curse Skill lowers an enemies resistances by 5% per point. It's best maxed out and used with a mage who can take advantage of that resistance lowering to do extra damage. Just one point isn't going to do much. When combined with a certain skill later in the game, Curse can become an excellent way to take out enemies with 2000+ HP in one shot.
