Herald of Ash backwards quality?

Is it intentional that quality on Herald of Ash makes the skill actively worse?

The buff description says 'Ignite surrounding enemies if overkill damage is at least 20% of enemy's maximum life'

Quality adds 1-2% to this overkill threshold, increasing the amount of damage required to trigger the effect. I don't have the information to confirm if it's actually working like this, but if it's not then the skill description is what's wrong. If it is working this way I think the quality component might be backwards, as I'd expect it to lower the required overkill amount to trigger.

I have seen this as well. Hopefully it can be fixed, likely just missing a negative sign somewhere.