Helicopter chasing an erratically flying light that abruptly accelerated and became extremely bright before disappearing.

2 witnesses parked at Torrey Pines State Beach facing the water just after sunset. Observed two crafts several miles offshore - one obvious helicopter due to the pattern of flashing lights and predictable motion, and one smaller craft moving much quicker with a single unwavering white light. The paths of the two crafts appeared to nearly intersect and once they passed each other, the smaller craft abruptly changed its course heading due north to at first follow and then pass the helicopter. The helicopter pursued the smaller craft for several minutes, but the smaller craft was visibly accelerating ahead of the helicopter. Eventually, the craft decelerated, the brightness of the single light increased significantly, and then it vanished. The helicopter continued heading north. Sighting captured on dash cam - video submitted is enhanced with noise reduction (to reduce artifact from night filming), color correction (to brighten footage as it was night), and zoom (to view objects far away). Video is quite compressed due to file size limitations of submission site. Please contact via email for full size video file.