Agent 49X: The paintball vendeta

the single BB you shot misses two lasers by less than a millimeter, it hits the button of the wall. The lasers turn off completly, you run over in the dark and turn the electricity back on, then you press the SHUT DOWN LASERS AND CAMERAS button. you go snooping around the room where you find a door which leads to the sercurity camera room. you can see a guard working, he doesn't notice you. You must take him out by...