Luna and Artemis Realize Their Plan Won't Work

Luna and Artemis toy with the idea of disguising themselves as Chibi Usa to fool Rubeus. They quickly realize that it is not such a good idea. (See previous cel for an example of how they imagined their attempt to pose as Chibi Usa. ^_^
Sailor Moon R Episode #74
Kill Rubeus! The final battle in the space void
Rubeus wo taose! Uchuukuukan no kessen