Kitty Likes Meat didn't specifically stop the Warrior from escaping; she just gave him a number of debuffs that drained his HP. That way, the Warrior had a chance of dying even if she couldn't continue attacking him anymore.
She then turned to deal with the Hunter. In fact, right from the beginning, she never had the intention of leaving these two players behind.
Turning into a demon likely led the audience and her two opponents to believe that Kitty Likes Meat could take both of them on at once. However, they didn't know that this was as strong as she could get.
If the Warrior didn't run and just tried to reduce the amount of damage he received while the Hunter continued to attack her, then the outcome today might have been different.
A consequence of the demon transformation was that Kitty Likes Meat's Armor was halved. Even with her current equipment, she wouldn't be able to withstand the attacks from two players, not the mention the Hunter's pet.
