Nicci, are you sure you want to escalate things to the use of an AoE mind-affecting spell?  Lustiel failed her Perception check (http://invisiblecastle.com/roller/view/4110797/) to notice the spellcasting, but she'll auto-succeed on the Sense Motive to detect that a large chunk of the people in the common room have suddenly come under an Enchantment effect of some sort, and her reaction is not going to be nice.