Help with dealing more damage under contions

So, basically i wanted to make a scythe weapon (and other stuff too), i wanted the scythe to deal 5 extra damage to entities without helmet...i have the procedure but ik that in the way minecraft works, with mcreator is basically impossible. Minecraft has a 10ticks delay when an entity is hurt, so trying to deal another value of damage is going to make the game crash or the damage is completely ignored. I really need help since i'm stuck on this problem for 1 month, i'm currently using 2024.4 version of MCreator. Thanks