Oh we have been having a great time for the last year. Enemy spell casters target my witch as the biggest immediate threat. Combination of evil eye, enervation, and a nasty capstone spell or slumber hex end a lot of fights in a hurry, so to keep the big bads alive and kicking, she has to be negated to make it challenging.
Blindness has come up often enough that I need a reliable way to counter it. Another favorite tactic of his is to endanger innocent NPC's. The witch is currently the only good member of our extremely neutral party, so if she has to yank a slave out of quicksand instead of fighting that drags things out.
My most recent blinder is a higher level witch with another PC's mother as a hostage. I'm not changing alignment, so there's no way to counter threatening innocents, but I want him to come up with a new trick besides blindness