The Punisher is a pasive enemy unit that rotates often to show you one of its two different cores.
If you use the wrong kind of energy to shoot down a core, it will turn invencible for a few seconds and will return attack.
-The green core side will trace your position and short after will perform a high speed snipping shot.
-The red core side will deploy a set of rockets that will face your direction.

Tips
-Take your time to shoot with the right weapon to avoid counterattacks.
-Shoot the core centers to get a coreshot bonus.
-The sniper counter will emit a beep an instant before performing the shot. Get ready to move away as soon as the tracer laser dissapear after this beep.