Problems with Spell Shield ability!!!

Problems with Spell Shield ability!!!

I'm having problmes with the Spell Shield (amulet) ability because it doesn't block some spells when based in Channel, Ensnare, Finger of Death, and some others...
It works normally for Storm Bolts, Chain Lightning, etc. But for Ensnare, FInger of Death, and Channel it doesn't work!
Somebody know how to make it work for these spells?

Thanks if help!

it doesnt block em because:

ensnare isnt a spell i thought. u can also ensnare magic immune units right?

finger of death cuz it can 'penetrate' even invulnereable units (except thedmg wont work) dunno why

u cant fix this problem

I solved the problem of the Ensnare in the Gameplay Constants:
Ensnare checks for spell immunity = true
But with finger of Death I don't know what to do, I hope that have a way.
The Hope is the last to die