Quick review - Launch Character is how the engine handles jump so you’re just causing enemies to do a large jump when you wish to launch them…if you want your “hero” character to follow then launch them too…
2nd question
Find your enemies using a Sphere overlap actors at a distance you like (use draw debug sphere [you can see it in the video next to my overlap actors] to help you visualize the size of your overlap)…that will create your array.
Set your “Hero’s” current location in a variable.
Use your array to get an enemy location. Move your “hero” character to that location (or past depending on what you’re doing) and tell that enemy to react/take damage. Do this for the next entry in that array and on until you are satisfied.
Move your “Hero” back to the original location you set before you moved them.
Hope this helps…