Caz,
he is correct in having to sign a ROS to attend an OCF. It may be this ensured greater pay etc, and at no point does he/she allude to any force being applied, so his statement was actually factually correct.
Returning to the OP,
I believe that all bets are off wrt ROS, particularly if in a shrinking trade such as WSOp EW. As an earlier poster advised - talk to the desk officer.
I can't see anyone stitching you over a ROS just to make you redundant in Tranche 2 or 3. Let's not kid ourselves - we know there is going to be some.