Bernard guides Gar to 4 black cables which all need to be disconnected to prevent Sebastian from targeting Tamaren. Why all four? Any targeting system would have become dysfunctional by removing just one of the cable. If the system can function well even after removing three cables, then 4 cables shouldn't have been there in the first place, only one cable would have been sufficient to make the system work.
The machine doesn't *need* more than one cable. It's a quadruple redundancy; as long as one cable is intact, the gate will work. Pulling all four was the only way to remove any chance of this.
The final shot of Conner flying is flipped; the S on his shirt is backward.
Footage of Kory being pulled into the machine is running in reverse. Her hair and body movements make it obvious.