Chain lightning hit box?

The way it works is it hits the closest monster to you. After you hit that monster, it looks for the next closest one in the direction away from you, with about 1/4 the max range of the first hit. If it hits that monster, it then looks for the next monster after that. From the second hit on, the range of all the successive hits is the same.

Only thing is it doesn't go backwards, so it basically scans a semi circle around the first monster and goes to the next. It may appear to go backward when you cast it and a monster it has targeted moves closer to you, making it seem to go backwards. If you keep using it you'll eventually be able to see what can be hit and what can't.