Questions about Zombie Ward
http://leagueoflegends.wikia.com/wiki/Zombie_Ward
How long after scoring a ward takedown (or assist) do I have to apply the bonus damage? Is it indefinite?
What happens if I have scored a ward takedown, and I takedown another ward before applying the bonus damage to an enemy champion? Is the damage the same or does it stack?
Is there any cooldown after applying the bonus damage that I must wait to acquire the buff again?
I think I know the answers to these questions, but I actually haven't used this rune because it didn't seem that good.