It is a gambit, no doubt, to engage your rival in a fingering duel. At best it is a race — at worst a countdown. One of you will cum, unless the hold is broken, and if you happen to be the one who attempts that break, whether that attempt is successful or not, you have shown your opponent that you are only a few strokes away from defeat. Strokes that she may take, while you squirm to escape from her grasp.