Given that Yinha thought she was safe with her illusions, and moving would most likely have caused her magic holy+fire circle to not work anymore, I think it's fair to assume she thought she was safe and could remain still.

Also, please remember that Kaze doesn't show any physical, outward signs of being blind - in case you were thinking to be clever and just suddenly decide to cast a dispel or cure on him [i]randomly[/i]... ;)
You'd [i]realistically[/i] have to have Kaze post before Yinha and do something like ...

"RAAAAAAAAAAH! MY EYES! I CAN'T SEEEEEEEEEEEEE!" *topples over and kicks in the air like a baby*