Let me start by saying that this flight really bothered me, because the rocket arced over to the crowd in attendance for the launches. Whether I am flying RC airplanes, or rockets, or rocket gliders, I try to conduct my hobbies in a safe manner. Also, the Mid-South Rocket Society in Memphis, TN, works hard to conduct safe launches.
The launch pad has a 5 degree lean, and is pointed toward the north (the direction the camera is facing). The wind was out of the north at 10 to 15 mph most of the day.
What happens in the video is, rather than arcing to the north, the rocket glider arcs to the east (right of camera). After apogee, my Switchblade starts to come down directly over the crowd (not a big crowd). Fortunately, the Switchblade performs perfectly (as usual): the engine ejects the nosecone, which releases the wings. The rocket glider makes a short, but effective, glide to the launch area.
I have several flights on my Switchblade, and most of the time it flies straight up.
In this case, I believe the wind shifted, to more of a northeast direction. This caused the rocket glider to 'weather-vane', and arc into the wind. This is what carried the model over the crowd.
This flight was NOT due to the design of the J&H Aerospace Switchblade. In fact, the reliability of the design averted an incident.
I should have delayed launch, until the wind shifted to a more favorable direction.