This quest becomes available immediately after Welcome to Hell, it is not autostarted, and other quests can be played instead, but Dane periodically nags to start the quest, and an objective to start the quest any time the Hub is used.
There are four objectives which are independent missions which can be started in any order. They can also be started from a map marker for each.
The objectives appear as Targets on the map, and are automatically displayed without exploration.
If "Rally the Twins" is attempted after the turrets are activated, immediately following the mission Gat/Kinzie will be attacked by a large number of powerful enemies that will spawn by the turret and enter the Twins' warehouse. To avoid being killed (or a lengthy battle immediately after the lenghty battle to rally the twins), immediately activate the Arcane Blast tutorial which will remove the player from danger as completing the tutorial automatically sends Gat/Kinzie back to the safehouse.