#1 - Nov. 4, 2011, 8:44 a.m.
Anyway, this shouldn't be shown. It's a useless information.
Edit: Happens on "breakables" aswell, with Bola Shot.
Edit 2: My theory is this. Bola shot is basicly delayed damage. It will damage/kill a target in the future. So if you hit it with another damaging ability, this triggers "Immune", as the target is already dead in the future.