Stuns are Broken?!

[spoil]

That's so fucked but that's probably the answer. So as long as the decrease mana by 100 useless side effect lands, the game considers that the spell landed successfully and was not resisted, even though it's identified and used as a stun.

I always use color slant first in a tight spot because it has a half-second quicker casting time and also a slightly bigger radius.