Like, I press a certain key and it kills the humanoid once you get to them kinda like I press a button behind them and it cracks their neck or something
EXAMPLE
I got behind someone with a linked sword, and then I stab them through their back (I have the animation for it)
Could I get help?
Please attempt to script this yourself first. This is, basically, a request, and Scripting Helpers is not a request site.
Some things to look into:
Animations Specifically, these three sections
Player:GetMouse Which gives you this With which you can use this