Kill 3 or more enemies from the electricity discharge of a dying electro armor unit
Best unlocked on Chapter 19 in the outside area (the one you enter by forcing that door-like thing open with X towards the beginning). When you see the flashy lights appear towards the garage-like doors, stand before it and ready your gun. These garage doors should open after you've killed the guys originally in the area and after you've killed the guys who come in by the dropships. When the garage door opens (should be the middle one), use your overlay and breach the blue-like man in the middle. Kill him ASAP, and his electric armor should discharge and kill the other guys that had spawned with him.
Should add to my above post - that this is most easily done on the Easy difficulty (obviously). Make sure that when you get to the right point that your Backfire is full. Get right up to the doorway just before it opens (you will know which one it is as a red light will be flashing above the door), and as soon as the door opens, press RB to go into Dart Overlay, then use backfire on the other troops to stun them, and then press LB on the main enemy so that you can take down his health. You need to do this twice to kill then enemy that electrocutes the others, and you have to stun the other troops first and go into Dart Overlay quickly, otherwise the troops will move too far away when you kill the enemy that electrocutes them.
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