On the other side of the mirror, the Doctor and Romana are reunited with Biroc in a stable, time-locked universe. A repentant Biroc explains they were the slave masters, travelling on the winds of time in order to ravage other planets and subjugate their populations as slaves until the Gundan revolt. The Doctor and Romana are returned to the null space, and are immediately captured by Rorvik. Rorvik's crew realise that the null space is shrinking as the distances between the gateway, the TARDIS, and slaver ship continue to decrease. Rorvik has ordered the crew to try to blast through the mirrors in gateway, believing it to be the way out, but the mirrors resist all attacks. With the gateway and ship in visible distance of each other, Rorvik resorts to one last attempt to break the mirrors by using the exhaust of the ship's engines against them. While the Doctor warns that this action will be as doomed as the previous ones, Romana regroups with Lazlo and Adric, and together they free the remaining Tharils on the slaver ship. The TARDIS crew flee to the TARDIS as Rorvik initiates his plan—the blast from the engines is reflected by the mirrors back onto the ship, destroying it and its crew.