Originally, I think the hay cube in question was Ethel's. Lucy snatched it and ran off. Lucy did not want to share - even if her kinder, gentler sister Ethel was completely willing to share.
Several edits in this clip keep the "action" sequences a little closer together.
At 20 seconds in, Lucy runs off with the hay cube (may actually be the second time).
At 55s, Lucy does it again!
At 1m10s, Ethel rejoins Lucy. Again.
But after Ethel rejoins Lucy, Lucy is giving off a major disapproving bunny stare.
Bonus - edited out of the above video is a close-up clip of Mr. Bunya munching his hay cube, totally unaware, or at least uncaring, about the hay cube battle between the sisters, going on right behind him.
Why should he care? He has his cube and nobody's messing with that one!
Do your bunnies or pets run off with treats?
Or other things?