She seems to know what she's doing, so he stands back as she lets the horse out of the stall. Then at her command, he darts over to the bench and climbs up on it, not sure what he wants him to do next, but he stays there, using this vantage point for the moment to keep an eye out for any grownups.

The rest of the animals don't seem too perturbed about this impending escapade. Some of the other horses are actually watching with great interest, craning their necks over their stall doors to try to get a better look at the juvenile outlaws.