They came up with a plan that involved saving Amaya’s village, bringing Mallus into a physical body so he could be killed, and saving Nora.
Nora was convinced to go after the Waverider, where she was captured by the Legends.
Everything went wrong when Damien Darhk — as supervillains are wont to do — betrayed them.
The team-up with Darhk actually got off to a pretty humorous start as he first tried to earn their trust and then expressed bewilderment at the Legends’ ridiculous plan for trying to get Nora, which involved tricking John Noble to read lines as Mallus while on the set of Lord of the Rings so that Ray could miniaturize himself, fly into Nora’s ear, and play John Noble’s voice inside of her head.