Nebula didn't let one victory distract her from the fight. There was still another giant with four arms to deal with, not to mention the cannibal woman who could portal in at any moment. Best to take care of this second giant before Mileena reappeared.
Out of the corner of her eye she saw Johnny go low, and successfully knock the giant to the ground. Nebula used that to her advantage, striking out with her clawed hand to slash across her throat. She rolled off the other side, and rolled so she would not have her back to the warrior if it got back to its feet.
"Finish her," she shouted to Johnny, who had a better angle at the vulnerable parts. "The other one will be back soon."