What i've found is that on the EMU server I played. If you use Divine Protection as a paladin then use a Goblin Sapper Charge/Super Sapper Charge. It will go "Fail to cast ____: You are immune" However the Goblin Sapper Charge effect will still be caused doing whatever damage it does to people around you, with no decrease in the stack of goblin sapper charges. Will possibly post a video or some screenshots if required, but for now I'll leave it like this. Try it out people. I'm sure it works, maybe not on live though.
Also, tell me if it does or doesn't work on live so I can add [EMU] to the title if required.
EDIT: If anyone can remove cooldown timers on Divine Protection or atleast Goblin Sapper Charge and Super Sapper Charge, then you can easily spam this during the invulnerability time.
EDIT 2: EMU Tagged again. But would like someone to remove cooldown still.6):