Audacious Charge Xin Zhao Bug

http://imgur.com/gnkCccc This Xin Zhao's Audacious charge was doing 500-700 damage per hit with Trinity Force + Brutalizer then full tank items. To my understanding Audacious Charge scales off AP

ACTIVE: Xin Zhao charges at an enemy, dealing magic damage to all enemies within 112.5 range and Slow icon slowing them for 2 seconds. MAGIC DAMAGE: 70 / 105 / 140 / 175 / 210 (+ 60% AP) SLOW: 25 / 30 / 35 / 40 / 45%

This image shows that Xin Zhao dealt the most damage on the team and more damage than my entire team as well. He did the most damage in the game as a tank with Trinity.

I'm assuming there is a buggy interaction with Trinity Force and Audacious charge? There is no way it is doing 700 damage while not even building AP when at max level it does 210. Xin Zhao charges any of our champions and they are instantly half health.

I didn't get a screenshot of the damage results, but I can promise you it was 500-700 every time, even if I am hit by it only once. He was 100-0 people with charge and 1-2 autos