Damaging player instead of mob

So I have been trying to make a makeshift dual wield weapon using mcreator. So far I know how to do it, although I have one problem. I start using the Event/Target entity block in triggers to make sure the player is holding the weapon, and also to swing the arm. But after that I try to use it to damage the mob that is being right clicked on, but it damages the player instead. I'm not too sure how to solve this problem.