A plan
The doctor, Yaz, Graham, and Ryan wondered who the doctor was talking to on the TARDIS phone River Song explain to Joseph Seth who the doctor is and how she knows her and their relationship and the doctor explained to Yaz, Graham, and Ryan who River Song was and the relationship between she and her and how complicated it is. They met up and the doctor was surprised to see just how beautiful her wife is and River Song felt kinda the same and River Song shared all of the information she gathered, and the doctor impressed with River's work and then linked up their TARDISES and transferred the data from the doctors TARDIS to River Song's TARDIS, Then they came up with a plan after the doctor realized what they were up against.