"Um...hoo..." Mellisande breathes, racking her brains for a way to help.
She looks up and murmurs a spell. Magic enfolds her in a soft golden glow...and her body seems to brighten, then stretch and blur into a single brilliant beam of light! In the wake of the spell, Mellisande is gone though...the space she was standing now apparently empty.
(Action: Blinding Color Surge, Will DC 19 or be blind, ad Mellisande is invisble for 5 rounds. Targeting the witch who's still flyng and not already blind. If none are flying, then either of the non-blind ones will do.)