Look at this knife I found! I'll stick it in the liver spot on the voodoo doll for a second while I ask this questin of requesting clarity . . . . . . 
in post 1404 you state : Within the smoke, as it fades, you see an eerily beautiful form, vaguely  humanoid in general form, but with horrible wings sprouting from its  back, a great flaming bow in its hands, and a long rope-like coil  hanging at its waist.  You clearly see this creature for just a moment,  and then she/it, too fades from view and is gone as the spell fails.
I am now noticing this phrase myself so bear with me. . . . . .
you answer my questinon perfectly with:  Post1404 edited!  Capizzio recognizes the creature that faded from view as an Erinyes Devil!
no problem.
 then in post 1407 you post:
you see that two creatures already flank the Drow:  One is a seething  monstosity that deftly wields a vicious, saw-toothed glaive while below  its toothy maw writhes a hideous, twitching beard.  It has a pelt of fur  from its belly to its ankles, and a pair of great horns jut upward from  its head at a 45 degree angle to the rear for 2-3 feet.  The other  creature is an emaciated figure that looks like a horned human skeleton  smothered within a bone-tight hide of slimy leather.  Both creatures are  approximately 6 feet tall, not counting horns.  The Drow says, "Curse  the villainous thieves and vile intruders such as I am!  Let them see much gain from  their larcenous escapades!  Smile upon them my minions! Serve your own livers  before their eyes and retreat with your own souls down to your  homes!  (Hell or the abyss, it really matters not to me one whit.)"
Is this to say there were 2 creatures hidden by the smoke? That is all I need to understand. 
ps, artistic license may or may not have been exorcised.