VSS Unity Rockets to Space With Branson, Crew

The video details a rocket's ascent into space, starting with a successful motor burn and reaching Mach 3. Passengers are cleared to unstrap as the vehicle enters space, with a predicted apogee of 279,000 feet. The pilots unlock the feather and activate the RCS for attitude control. The video concludes with a message from Sir Richard Branson as the spacecraft crosses the boundary into space.

What happens to the passengers in the back during the flight?

What is the significance of the RCS or reaction control system during the flight?