Lee Sin Ability (LoL): Tempest / Cripple
Tempest / Cripple Lee Sin
E

Range: 350
Cooldown: 10
Cost: 50
Cripple (30 energy): Lee Sin cripples nearby enemies revealed by Tempest, reducing their Movement Speed by 20 / 30 / 40 / 50 / 60 % for 4 seconds. Movement Speed recovers gradually over the duration.
Tempest does not reveal invisible targets.
Is there a bug makes tempest hit twice dmg?
There used to be but they fixed it a while ago.