on the mission where you have to plant a microphone on an intercom in the beige tent...i cant quite figure out what i am doing wrong. i killed all 4 gaurds (3 patrolling and 1 in the tower) i hid all three patrolling gaurd bodies and when i go to plant the microphone..as soon as i do the alarm sounds as if i have been spotted or something. i dont know what i am doing wrong here. does anyone know? thanks.