Have collected both payblock and specialeffects plugin as one thread :D
I know the 1.5 update's release date has been moved forward continuasly but i had much work from the school have started fixing bugs and a 1.5...
Try looping it
Search for air
Just get the two blocks in front of him and teleport him to that location
You could just use the entity of the lighting then get the player target by the commands location and strike entity lightning there and hurt him.
Separate names with a comma.