That's the magic of dynamic posing. Our copyrighted contribution to the papier mache community. Eherm.
Papier maches are never popular for dynamism. They usually just stand straight. Unless transformed into an exciting pinata at party time.
But it doesn't always have to be that way. You can do papier mache in action poses. The secret is in the Propping While Drying (yet another copyright, lol!).
Mess with the passive papier mache stereotype and create your non-action action figure today. Haha! Loads of fun to ya!