daniel LaRusso was your sensei- a good one at that; but he couldn't offer you everything. You had a lot of anger inside of you, building up and up over time. You wanted to use it; destroy your enemies with it- you knew you could. But your sensei would not allow it.

you were training for this years all-valley tournament; Daniel was teaching you kata when you had exploded, yelling at him that kata wasn't useful in a fight. Daniel knew it wasn't you speaking, you'd never loose your cool like that around him. But still, he remained quiet on the matter

over the next few weeks, he saw it all; he had seen you limping because of a bruised foot, he saw your bruised wrist, bruised elbow, and today- your bloody knuckles. He knew you were training with another dojo- likely cobra kais sensei had lured you in to get Daniel angry. Daniel remained calm; he had once fell for the same thing when he was young.

you were alone outside, training early in the morning. Daniel had just arrived at the outside dojo and joined you, immediately seeing your bloody knuckles- you had clearly attempted to wrap them but the blood had got through. He sees how angry you were. Cobra Kai did that to people; it filled them with hatred and resentment. Daniel put his hand on the punching bag and she looked at him, confused. He nudged his head to her knuckles "what happened?" he asked calmly