Use this Stratagem in the Reinforcements step of your Movement phase, when a HIVE FLEET TRYGON or HIVE FLEET TRYGON PRIME model from your army is set up on the battlefield using its Death From Below ability. Select one friendly HIVE FLEET unit with the Troops Battlefield Role that is in Strategic Reserves. Set that unit up anywhere on the battlefield that is wholly within 9" of that TRYGON or TRYGON PRIME model and not within 9" of any enemy models.