This sort of falls outside of my realm of expertise, so I'm throwing the question to the forums.
Our 10man group was debating on bringing a boomkin in for the Lich King fight, specifically for getting the Neck-deep in Vile achievement for 3.3. Now, obviously Starfall is getting a buff, and I know it would not be up for every wave of Vile Spirits. Be that as it may, we've never had a boomkin along with us for the LK fight (even on 25man), so I was curious if Starfall can hit the Vile Spirits while spawning (if not, at what point does it become viable to pop Starfall), and is unglyphed Typhoon a decent method to knockback Vile Spirits as they close in on the raid. I'm not even sure if they can be knocked back/stunned/snared/rooted, since we generally just ignored them and spread out the damage. I'm sure there are plenty of boomkins here that have personal experience with the Vile Spirits, or have actually completed achievement and can offer some advice.
Thanks in advance!