With Harris' speed you would have to respect the go route but with the formation it would be difficult to get a good jam on Atwell running the out.

[spreadoffensefootball.com]
This Go-Out concept is a high-low concept for the corner. The receivers on the line of scrimmage will run a go route, trying to get over the top of the corner. The receivers stacked behind will run a five yard out.

Pre-snap read from the QB will be to first check the depth of the corner. If the corner is rolled up at, or under 7 yards, then the QB can anticipate throwing it over the top on the Go route. The width of the $ and S will also tell the QB where he has leverage on the out routes from the #2 receivers stacked behind.

Post-snap read from the QB will be to read the hips and the peddle of the Corner. If the corner is playing zone technique where his hips are open and inside while peddling out, then the QB will throw the ball on the out route underneath the bailing corner. If the corner’s hips are square and he’s squatting in position, then the ball will go over the top to the Go route.

Most likely in this single high look, the corners are responsible for everything in their deep third, and will back pedal to stay on top of the go route.