Hi @Nikhil,
Again, the Triger once needs to be under the “for each”, and you can remove the empty event above Player Health variable, and move Stop enemy and change Player health under the for each as well, where triger once is.
In my example I have multiple enemies, like 3, that I multiplied, and then I added them to a group “Enemy”, and I then do for each enemy and it worked for me.
Sorry for a bad image, only had snipping tool, but you get the point 