Just after Chuck did an end-of-walk power slide over the top of her and flipped. She was pissed because he came from behind. Just like she does every time she attacks Chuck.
I think Chuck was tired, because he normally jumps over her, with a brief neck bite and turns it up, accelerating so fast, Coco can’t keep up. I think that’s the name of my next feature film project: Coco Can’t Keep Up.