Katarina throws a Dagger at the target enemy that bounces to up to 2 nearby enemies, dealing 75 / 105 / 135 / 165 / 195 (+30% of ability power) magic damage to each target. The Dagger then lands on the ground 350 units opposite from where it struck the target.
The Dagger bounces to targets regardless of having sight of them or not.
Pain in the *** this move
You are right. Very nice harassing and teamfighting.