The move you are requesting is definitely possible. I'm not sure where you can learn it as I don't have any tutorials on it, but I've been using my own handling as a finisher for one of my routines for quite some time. Essentially, the move looks like an ordinary thumb-fan, with the target card popping out from it (Popping, not shooting. That is, it doesn't leave the fan) at the command of the spectator. The fan can be burned by the spectator right before the pop-out takes place.
Because of exposure I obviously won't explain it in full detail here, but if you shoot me a PM I'll help you get on the right track. Otherwise, just keep on experimenting, I'm sure you'll eventually stumble onto something that works for you.