Meanwhile, mercenaries led by Emil Stenz (Jason Clarke), who had disguised themselves as video technicians to get inside the White House, start killing off most of the Secret Service and take the tour group hostage, but Cale manages to take a gun and escape to go find his daughter. Retiring Head of the Presidential Detail Martin Walker (James Woods) escorts the President and his detail to the Presidential Emergency Operations Center. Once Sawyer gains access, Walker kills his detail, revealing himself to be the real leader who wants vengeance against Sawyer after a botched black ops mission resulted in the death of Walker's son. Cale, who failed to find Emily, kills a mercenary and takes his gun and radio. Overhearing the radio, Cale locates and rescues Sawyer.