Leopard Sister made a move, but the one getting beaten was Big Baby!
After Leopard Sister finished, Leopard Brother bit Big Baby's ear and dragged him to a secluded spot, presumably for more beating, the kind where they talk while getting hit.
Although Leopard Sister hit her son, she didn't show any favor to Sister Leopard, feeling angry about her abandoning her cub.
While rationally she understood that such choices are animal instinct, emotionally she couldn't accept it. Big Baby, although seemingly not very bright, is definitely a warm and caring male, who would never abandon his partner and child.
When there's a partner helping to raise the child, every child should be cherished and not abandoned.
Sister Leopard also knew her actions displeased Leopard Sister. After all, when she made that choice, Big Baby angrily told her that even if she abandoned the cub, he would never give it up, as Leopard Sister had taught him not to give up until the last moment.
