As expected then. This will never work. The Get Actor of Class gets the first actor it can find in the world, not the actor that just lost health. Think of it as of Random Actor. We can’t use it. Also, the binding executes every frame - read the tooltip of the node - it tells you to specifically not use it like this.
You are using a widget component for this, right? Have a look at this thread:
Same question answered yesterday.