So it only needs one missile per circle there? I've hit it with tons and nothing happens. Urg.
What was the mission that needs emp and ewp to complete?
No, it needs multiple missiles per circle, which is why missing once can screw you up, because to hit all of the targets you need to empty 4 missiles on one target, four on another, then four on a third, and your missiles wont reload fast enough to let you get an extra shot in if you miss.
I've only ever used EWP on Aeten Defense and Ascendency Barrier, but I use EMP on Polith Minefield up, as on Polith it clears about 110 mines in one click.