Any damage that kills a unit with Nora Shielded doesn't generate any nora. I think it may actually be any damage that takes a unit below 0 HP (so at start of turn, even if a unit would regenerate and stay alive, the nora won't be generated if an attack takes it below 0 HP first). This doesn't match the description but I guess it was put in to stop generating too much nora from over-kill. I think it should at least generate nora equal to the lower of a unit's remaining HP or the damage applied.
No nora at all. If you have 5 HP and take 10 damage you get 0 nora. What I'd like is for it to still give you 5 nora in that case, or even 10 like in the description (though that could be abused a little bit).