Arisu prepared to attack. She ran at him again. He would probably notice the similarity in her attack, but Arisu was planning to change up her attack slightly. She had three forms. She had only shown two. She could still use the third. 
Arisu leapt at Keith. If he tried to dodge, she would morph into a fox for better running. If he tried to counter, she would dodge by becoming a fox, she would be smaller. And if necessary, Arisu did have the ability to posses people.