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Quote from RoboSparkle:
2) I'm certain that the game does not allow you to crack the code without taking out the guys. I'll give it a go though.
An area I saw you do this was the disruptor moments after the area I previously mentioned. For the second one you used smoke pellet (IIRC) so why not just use smoke pellet for the first one to? I think the enemies are so close together it would work.