http://www.freewebs.com/masterpikachu/ZC%20Content/Incomplete%20Quests/LOZ%2DGeneration4.qst
I just set up and tested out the Cane Of Byrna, and when I activated it around the magic mirrors and prisms, its beams got stuck in the mirrors and prisms.
By the way, aren't those mirrors and prisms supposed to reflect only wand and enemy magic, if neither magic mirror rule is checked? I mean really, the sword beams are reflected by mirrors and prism, only with that particular rule checked, just as intended. Also, the whistle whirlwinds are reflected by the mirrors only with its corresponding rule checked, which is also intended.