Plot summary
Mace holds a press conference for Daisy, celebrating her "undercover" actions, until a sniper attempts to assassinate him. Coulson and Mack escort Mace and PR agent Burrows —who is often seen near Mace with a mysterious briefcase—to a quinjet, but it explodes mid-flight. Burrows is flung from the plane with the briefcase and the others crash land in a forest. There, they find ex- Hydra agents, hired by the Watchdogs, who have recovered Burrows' body. In the ensuing fight, Mace tries to get a serum from the briefcase, but it is destroyed and he is injured.
Mace explains that he is not an Inhuman and that he was given his abilities by a super-serum from the government to create a trustworthy, enhanced leader of S.H.I.E.L.D. After their rescue by Daisy and the May LMD, Coulson tells Mace to continue as "the Patriot", the face and political leader of S.H.I.E.L.D, while Coulson takes back command of operations. The May LMD discovers her robotic skeleton from a wound and Fitz secretly begins studying Aida's severed head.
Credits
Adapted from Wikipedia contributors, Agents of S.H.I.E.L.D. season 4. HTML formatting and reference markers removed.