It is normal to slip out of a raft downstream. This enables the stream to help close the raft up again.
When the yacht has left, the other pulls themselves back alongside and makes fast.
( ( ) ) stream
This boat remains securely moored
Leaving a Finger Berth
It is sometimes necessary to get the stern into clear water before reversing away. This will stop the fenders popping out or counteract an onshore wind. A bow spring will take the stern away from the pontoon before reversing out.
Brief the crew. Rig the bow spring and stern line as slip lines. Place a fender near the bow. Slip and recover the stern line. Engage ahead until the stern comes away from the pontoon. Engage neutral, then engage astern. Slip the bow spring and reverse out.