Why are reverse thrusts open here?

[taeik]

Hello, just watching through a video in YouTube, this guy show's a take off in what looks like to be a Singapore Airlines B777. Looking at the engines, the reverse thrust is open during takeoff!!! Is this usual? If this is serious shouldn't the FAA know about this incident. Appreciate replies thanks!
VIDEO: Headed to Hong Kong - YouTube (http://youtu.be/PiRK2E-dEEQ?t=1m14s)

[Phalanger]

Firstly that's not a Singapore plane. And to answer your question it would have to do with the fact the plane is landing. Need to stop believing what is said and use the fact presented instead.