From the second battle round onwards, at the start of your Movement phase, if you did not select the maximum number of GREY KNIGHTS units from your army using the Gate of Infinity ability at the end of your opponent’s previous turn, you can select one GREY KNIGHTS unit from your army that is on the battlefield that could have been selected using the Gate of Infinity ability. Remove that unit from the battlefield and place it into Strategic Reserves.
Designer’s Note: This means that your unit can retain its position on the battlefield at the end of your Command phase, and then be placed into Strategic Reserves at the start of your Movement phase, to set it up again in your Reinforcements step in another position.