Craft flying up behind then out front of Space X Rocket launched from Florida

Was unloading car, turned around and seen Rocket with white plumes behind it in sky looking South towards Lancaster, looked really cool so I videoed about 30 seconds of it then went about unloading rest of car . Later I watched it back and noticed at 12 seconds in there was a small light very fast goes past rocket. When I paused the video and went frame for frame you can plainly see a craft comes up behind then beside then out front where it takes off like a flash. Whatever it was it was going way faster then that rocket