wlayton, exactly!!! Think about it. If you are running with a WR 30 yards downfield, common sense says turn around. By the time a WR is 30 yrds downfield, the ball is either in the air, is going to another receiver, or the QB is sacked. It makes no sense to never turn around.
When I played some at CB, if a guy was running a 9 route, if we had his speed times and matched, we turned around at 10 yards and kept one hand slightly on his hip while finding the football with our eyes.