"Worst Case Scenario: you die, But who knows, maybe you wont"
During the initial attempt by Guardians to retake the Moon from the Hive, Cayde-6 ended up in a most peculiar situation. Falling back from overwhelming Hive forces, he took cover behind a crashed jumpship, only to discover that a Fallen Baroness was there as well. As they both had a common enemy, the two opted not to kill each other, and continued to fight the Hive. After most of the Hive were killed, Cayde returned to the crashed ship, only to find the Baroness mortally wounded. In the end, he was forced to kill her.