I want to preface this by saying that I haven't been an active player of the alpha (other that a little bit of time to check it out), so take what I say with a grain of salt.
Anyway, wanted to throw out the idea of this talent being based on shooting over or through surface effects rather than just targeting enemies on the surface. This would then be inclusive of enemies on the surface as well, but might add some nice tactical movement and the ability to potentially extend effects to mobs who you are having a hard time getting onto a specific surface.
Just a thought.
