Reactor - help making leaves react to hit_box

[Anonymous]

Hey, 

Looking for a bit of help using reactors. I have never used them before so just trying to wrap my head around how the work. 

I have created a simple bush for testing purposes.

I want to make the hit box collide with the leaves (that form a bush) and make them explode/disperse outwards, reacting to the collision of the hit_box. (example image below)

1) Will I need to make proxies for every plane (leaf)? 

2) what is the most effective way to achieve this using collided reactors?

Thanks.