As Willow moves around behind Jenny's desk, the backup disk containing Jenny's translated Ritual of Restoration slides inconspicuously from a stack of papers into the narrow space between desk and filing cabinet.
As Willow moves around behind Jenny's desk, we hear Buffy's quiet voice continue. At that precise moment, the backup disk Jenny created slides inconspicuously from a stack of papers and falls into the narrow darkness between desk and filing cabinet.