I could see in the twitch preview that this was still an issue.
The lightning field, which appears like an ele staff 5 field, appears to be friendly fire for a second before the red circle appears. Smart players will take this as a field to run into and use combo finishers. But the red circle appears late and smart players will get punished for no reason.
Also, since it is a different field than the elementalist one (it does damage standing inside), it should just have a different effect altogether. Maybe tint the lightning and place a glow on the ground to show that it is part of the effect area too.