"Fighting modes" refers to different mental or physical states in which someone is ready and prepared to engage in a conflict or combat situation. Full definition
If you're in fight mode, then say something. (inc.com)
If you're sure you're right and the other person's wrong, you're already moving into fight mode, where your child looks like the enemy. (psychologytoday.com)
There is a single fight mode where you can choose to fight against a CPU opponent of your choosing along with whichever difficulty you choose. (gamerstemple.com)