This can be done in either story or challenge modes. I suggest challenge mode, as you can just keep retrying and not have to rely on getting back to where you were if you died. The challenge I suggest is found early on in the game and is the second challenge you come across called "Frag". You must kill all enemies in a time limit. When it starts, go to the bottom left area and you will see 4 enemies all close to each other. Warp around and get them to shoot each other at the same time.
Alternate Method: What might be easier for some, is to just wait until you have an ability that lets you walk around in a type of "ghost" mode. It is called Echo. Run the invisible alien in-between two enemies and you should be safe as they fire at one another.
I found it was most easily done on one of the challenges. I forget exactly which one, I think it is the 4h or 5th one. In any case, there's a open area to the right with two guards at its top end and two guards at its bottom end. Echo yourself right into the middle of that space and not only will at least two of them shoot each other, but if you play it right, all four might shoot each other too.
You need to register before being able to post comments.