User blog comment:The Lost Marbles/Seles, the Shooting Star/@comment-7709681-20140802203047/@comment-25193301-20140802203807

Q is a single-target on-hit spell, whereas you'd use E for the AoE damage component. The collision thing is a bonus for good aiming or positioning, which is a focal point of her design. That's just my take on it, though I think the radii could use some adjusting. It's a similar concept to how Syndra's kit works without her Dark Spheres, but they overall tie things together.

Will do on the W description, and that's a good catch on her R.