I had a look in NI at RI and MI because I was interested if it somehow detects being hit. It seems to me it simply invokes a helper spell reapplying the mirror image effect every round. But what if a character with more attacks hits the caster with the first one - won't it dissolve the image, making subsequent attacks sure hits (assuming to hit roll successes OC)? I am completely new to this, but vanilla MI doesn't do anything differently from that helper spell that would suggest to the contrary.
