With high level of leech it means u wanna kill fast but u also facing the death, however, with high level of fear u have high chance to atk, high to survive, high to escape, despite of with long fighting u have high chance to win, look at shaman, only blind is OP. Im always using life exhaust but this skill just making enemy's chance to atk/use skill on me. Long fight with high chance to win is better.