I agree with both here, but I don't think interpretting a saving throw for creatures brought into the area contradicts the text. Even if it does *a little*, it makes a huge difference in balancing out this spell by granting a save. Neither the spellcaster or the creatures lose out in any significant way, it just gets balanced. For example, why cast it on an area with this ruling? Simple, ALL creatures must make a save in that area. Why cast it on a creature directly? Again, simple, the creature alone will take the silenced effect wherever it goes. Both are advantageous in different situations. By applying a Will save for all creatures, the BBEG that is a spellcaster can make his Will save and not have to worry about taking extra feats and sacrificing high level spell slots to out-do low level spellcasters.