Replicating default flicker

[DustyPorViva]

I'm working on a custom movement system, and I'm trying to find a way to replicate the default flickering.

Needs to:
- flicker the player, but not the shadow
- not hide the player's nick as well
- not interfere with the player's gani(after the player 'flies back' when hit, they are still able to move, but will still flicker. This means setting the player's ani will making continuous animation like walking loop and such... not pleasant to look at)

hideplayer and player.alpha/zoom/etc... each do at least one of the above.

Any suggestions?