When Bane has the damage steal buff from Enfeeble, an enemy Rubick can stack the damage reduction debuff on Bane.

1. Skill the "Enfeeble Steals Damage" talent
2. Cast Enfeeble on an enemy
3. Have an enemy Rubick steal Enfeeble
4. Have them cast Enfeeble on you twice

Result: While you have the Enfeeble buff, the debuff stacks on you.

Expected: The debuff should never stack. This is the only scenario where the debuff stacks, and it shouldn't do that.