Thank you for the feedback.
About the Line of Sight issue, it is disabled in The Tasting Room at the moment until the entire system has been corrected. (The mentioned room is the area the boss is in)
About the Yeasty Alementals, the healing beam is transferred to the player if he is between the Alemental and the boss (and there is no healing on the boss during that time). You can see the beam being redirected to me in the ss
http://pokit.org/get/img/84eea0185fa...55dd163a66.jpg
The challenge mode rewards are being worked on, it is a general issue and not something related to this instance
I hope that cleared some things up. This boss is quite unique because of its difficulty. If you are having difficulties guides may help out. Bursting the boss down by out-gearing the instance will not be possible once the gear downscaling for challenge modes is implemented