I saw this used in Soul Shatters and I know roughly how to do it but not in an animated way. (just the neon effect)
video:
robloxapp-20221007-2241260.wmv (2.2 MB)
thanks!
That flash of color or texture looks like the forcefield material.
There are two parts in the video, one uses the default plastic material and the meshpart that will use the forcefield material is a little bit bigger than the regular part. I position them the same and make the forcefield part 0.01 bigger on all xyz axis.
I’m guessing that the player in your video shows the character’s meshpart is cloned and the cloned one is welded to the original part so it stays in place and change the cloned part’s color and use the forcefield material on it.