The Capture of Winter Soldier was an attempt by the Joint Counter Terrorist Centre to find the Winter Soldier, who was believed to be responsible for the Bombing of the Vienna International Centre, and bring him into custody.
During a conference, T'Challa watched as his father, T'Chaka, gave a speech about Wakanda and its unfortunate involvement in the creation of deadly weapons made with vibranium, using these as his own reasons for signing the accords.
Hearing commotion outside, T'Challa realised danger was incoming but was too late to stop his father being killed in a terrorist attack secretly orchestrated by Helmut Zemo under the disguise of the Winter Soldier.
Sam Wilson informed that to Steve Rogers and with Sharon Carter, they watched the news report that the authorities suspected Bucky Barnes had done it.
While the fire was being put out, T'Challa mournfully took his late father's ring and took over his rightful role as King of Wakanda.
While considering his next actions, T'Challa was greeted by Romanoff who expressed her own grief at T'Chaka's death and promised him that the Joint Counter Terrorist Centre would find and arrest the Winter Soldier. T'Challa however informed Romanoff that he intended to find and kill the Winter Soldier himself.
Rogers called Natasha Romanoff and asked her if she was alright. After she said she was fine, she urged him not to go after Barnes. He refused, saying that he was the most capable to confront him and he hung up.
Rogers and Sam Wilson met in a nearby bar, and Wilson asked him if Romanoff had told him to not interfere. Rogers said that Barnes would have done the same thing. Sharon Carter then entered, giving Barnes' location in Romania and a warning to Rogers that the Joint Counter Terrorist Centre had been given the order to kill Barnes.
Against the warnings of Romanoff, Rogers and Wilson went to Romania. Rogers entered Barnes's apartment and saw Barnes. While Wilson updated him about the task force's location, Rogers asked Barnes if he remembered him. Barnes said he did since he had read about him at a museum.
Rogers warned him about the task force coming for him, as they thought Barnes had caused the Bombing of the Vienna International Centre, but Barnes assured him that he had not done it.
Rogers asked Barnes why he had pulled him out of the river during the Battle at the Triskelion, but Barnes said he did not know why, although Rogers thought otherwise.