Circle below npc and enemy

  • So i was playing the game with a character that was going to be a swordsman and when i started playing with him i noticed something diffirent.
    there was this circle that would show up on a npc and on a enemy and it would even change color on depending on what i was doing but then when i decided to skip to yahoi east (my char is lvl 30) to buy the third eye scouter the circle just dissapeared. i tried using scouters with the same effect of my last one that was from the yahoi fortress and still it didn't work. Can anyone tell me how to make it show up again? it's a really useful creature that magically showed up while i was playing the game.