Dr. Voodoo Ability Accuracy Decrease

When Dr Voodoo places Brother Daniel on the opponent, is that 50% decrease flat rate or directly deducted?
Or in other words, if Mephisto has 13% chance to proc his aura, is it no - 37% or 6.5%?
Thanks for the help y'all!
Or in other words, if Mephisto has 13% chance to proc his aura, is it no - 37% or 6.5%?
Thanks for the help y'all!
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