Robin and Bella are having a wrestling match and things are pretty evenly matched until Bella lifts her up and slams her down into the mat with all her might. She lays right into her and pummels her until she practically begs to let out of her grasp. She knows that she'll never be able to best her in a match since she's so strong and out of her league.
Kim needs to teach Mariah a lesson and she knows just how to do it. Rather than beat her, she is just going to hold her in a scissor lock until she gets bored. There are plenty of other things that she could be doing to her, but she knows that holding her like this until she passes out is really the best way to show her dominance over her.