(Possible) Annie/Darius bug

Just got out of an ARAM match. I was playing Darius. Any time I attacked the enemy Annie I could not stop. Darius would auto path and auto attack and I could not make him stop. The only way to get control of Darius was to kill her. I could still cast abilities as long as they targeted Annie and once she died I was able to regain control of my character. This happened 3 times and each time it resulted in me mindlessly walking under their tower to die.

Darius acted as if Annie had a permanent Rammus taunt after attacking her.