Slash effect

I'm still not too sure on how to do a slash effect by the vulture onto the worm. But I did some research and according to some, I can try to achieve this with a particle system that gets instantiated when the animation starts and destroyed once it stops. However, to do this, I think I have to animate the vulture's attack so I can attach a particle system to it somehow in unity.

There's also another way, which is creating a C# script to it. I found a script at someone's link but it's too long and I don't even know some of the commands and function in it. I'll have to check with my group members again or maybe even Mr Ron.

Heres the link to the script: http://www.unifycommunity.com/wiki/index.php?title=Trail_Arc_Renderer