Aimlock doesn't do shit if the player is hiding behind a wall, tree or even a car.
Your aim must be at the player so that the aimlock detects the enemy as it aims at his head constantly, it doesn't fail at anytime.
a small notice, I've played alot against Panzer and he's ez pz :v, to be honest He've got good skills. but no, he can't be accused of aimlock.