well if its your room that your doing this in and you have control over it. you can have it set it to moderated only and have no one voiced till after its done. im not quite sure how you have the answering system for it set up. they are supposed to answer after the pic is done correct? because you can easily have it set the mode to moderated on the intial command and then after the flag is done being made you can have it unset it from moderated so they can talk again:)