Clientside mod that disables grace?

I tried to go looking for a mod that disables grace (aka the Invincibility frames you get after being shot), found plenty of them but none that affected clients in a lobby, only the user who has the mod, and i was wondering if someone could make a mod like that? (or atleast give me tips on how to make a clientside mod [my knowledge of LUA is super limited :p])
Thanks in advance!
SuperBLT
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