Rocket chaser coming in hot on my tail

We have a strap-on MateCam 808 shooting down our Nike Smoke, and during the parachute decent, we captured the launch of this M-motor rocket screaming up past us (bright point of light in top left corner of photo).

We went to 11K ft. and peaked at just over Mach 1.1
Here is our video medley with RocketCam footage.