[Rq-rules] Question about multicast

[Fred Vogel]

>I have also made most Divination type spells Active
>(like Mystic Vision). Its really annoying for a GM to
>have players walk around all the time being able to
>see everything.

Clearly if you are using an active spell you have to concentrate on it.  But 
let's say for the sake of arguement, if Mystic Vision were a passive spell 
rather than active; why is that a pain for the GM?

Fred