If you want, you can go to the laser to get bonus points, but you will have to turn around to get back to the path leading to the reactor. If you don't want to go to the laser, then go the other way towards the reactor. When you get to the part with the Zero-Gs, target the cannon or one of the troopers to follow the correct path. Then target the reactor again.
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"Intensify forward firepower!!"
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