go really fast and then stop really hard. Just make sure you stop before the person or are able to slide off to the side. How long have you been riding? If you dont know how to do this just from riding you probably shouldn't be trying it. You're going to hit someone.
Watch the second half of the video where I demonstrate on a groomer how to power schuss from many different angles. It's all about having enough speed to dump on a knoll or bump or better yet, a pocket of powder.