[SSmutz]

Bomys are imaginary creatures. The creator of an imaginary thing, place, person, etc, can do what he wants with his/her creation without worrying about the laws of physics. Consider bird catching, for example. The laws of physics don't apply to all of it, such as how bomys can just float in the air by themselves and need ananchor to get down. It's just another part of the imagination. And in the case of bomys (the imaginary creation), they were created the way they were created, and they do what they do, because Stefan, or whoever it was, (the creator) wanted them to.