Last session was the first time in my first ArM5 saga that a magus's spell has been blocked. A SG knight errant was over-excited, someone tried to cast a spell to calm his emotions, and the divine power of a holy relic worn by the knight prevented the spell from affecting him.
As I narrated the outcome, I realized that, while I clearly understood what happens if the spell penetrates, I didn't know what happens if it doesn't.
The spell would still be sucessfully cast even if it just had an individual target, I believe. Would the magus know that the target was not affected instantly, or would they have to wait and observe the target's emotions to know?
I'm sure this is right in front of me in the book somewhere, but I couldn't find it.