Should Ashe E (Hawkshot) have charges or bounce off of objects?

I think that the 40 second cooldown is quite long for that kind of ability. Even quinn's which reveals a much larger area has a lower cooldown. I think to rework it, it should either hold charges, or bounce off of objects.

charges: Stores up to 4 charges, 5 second cooldown, new charge is stored every 15 seconds.

OR..

bounce: Lasts for a duration of 5 seconds, any wall it hits it ricochets off of. It can ricochet off of walls, buildings and structures, pets, minions, and champions. If it hits a champion, it should do 1 true damage to stop people from backing at a far range.