Question Immortality glitch?

[totalek]

Hi,
Today on a HVH Server I saw a guy, not Mod or VIP using skeet, who was immortal, Zeus, knife, HS nothing could kill him there was a sound when u hit him in the head but nothing happen he was just immortal is it a glitch or a new lua?
If it's a glitch somebody knows how to preform it and could tell?

 

[mooreplease1]

It is possible that they had access to admin privileges and godmoded themselves on other accs