Eu encontrei a resposta olhando para mundos selvagens showdown :
Each additional action attempted in a round subtracts 2 from all the figure’s trait rolls. If an adventurer wants to fire a gun with one hand and slice at an adjacent foe with a knife in his other hand, for instance, he subtracts 2 from both rolls. If he also wanted to Taunt someone at the same time, he subtracts 4 from all three rolls.