Crowvahkin,
You are breaking at the knees before breakng at the hips to initiate the squat. Hips and knees should break simultaneously. So, yes, your knees are traveling forward for the whole squat (knee slide). Hips and knees should break together and knees should travel forward for the first third of the squat. Hips should continue to reach back as you push your knees to the sides.
Tell the guy lurking behind you to take a hike.