I also forgot to mention my pre-teleport actions, which would be to activate Haste on all of us, which should help add a bit of speed, though probably not enough.
--edit--
And when Vist says everyone should concentrate their attacks, should they concentrate on the (hopefully stunned) Cornugon, or on another enemy if he's actually stunned for the 5 rounds? If he is stunned, I could probably tear through him pretty handily, even with his fire immunity and acid resistance, but then other enemies are free to keep attacking.
--edit2--
Also, Oslecamo, I assume the fireball and ice storm effects are SLA's, right? Do they need to roll against my SR?