I'm still trying to figure out why I had to land with no throttle. The only thing I can think of is that I goosed the throttle right before it happened and caused the ESC to do a low voltage cutoff. It could have also been the heat since it was 109 F when the video was taken.
EDIT: After the plane did the same thing several times, and after swapping ESC's, I was finally able to determine that it was a faulty Zippy 3s 2200mAh battery that couldn't maintain voltage under load. It's now relegated to ground station work only.