Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: What is the name of Sean's associate on whom O'Neill whistle-blew? Title: Patriot Games Movie plot: Jack Ryan (Ford), a retired CIA analyst is on vacation with his family in London. After giving a lecture at the Old Royal Naval College in Greenwich, Ryan and his family witness a terrorist attack on Lord William Holmes (Fox), British Secretary of State for Northern Ireland. Ryan intervenes and disarms one of the assailants, and kills another two with the disarmed assailants firearm. Injured by a shot to the shoulder, Ryan waits for the police to respond, as the remaining terrorists flee. Whilst recovering, Ryan testifies in court against Sean Miller (Bean), a member of a Provisional Irish Republican Army splinter group. Sean is the assailant Ryan was able to neutralise in the attack against Lord Holmes, but had also killed his younger brother, Patrick Miller in the ensuing gun battle. Sean is later convicted for his crimes. En route to Albany Prison on the Isle of Wight, Sean's prison convoy, escorted by the Police is ambushed by his comrades, including Kevin O'Donnell (Bergin). The Police Officers are executed, including Inspector Robert Highland (Threlfall). Free once more, Sean and his comrades flee to Northern Africa to plan their next kidnapping attempt on Lord Holmes. Seeking vengeance for his brother, Sean tries to convince several members of the splinter group to go to America with him, to kill Jack Ryan and his family. Ryan is later informed of Miller's escape by Vice Admiral James Greer (Jones), and Marty Cantor (Freeman), a former colleague of Ryan's, who mentions that it is possible Sean has fled the country, thereby indirectly implying Ryan's life is in danger. Greer attempts to recruit Ryan back into the C.I.A.. Ryan however refuses, confident that the IRA will not follow him to America. London, where the opening scene takes place. (Westminster Bridge over the Thames) Meanwhile, in England, Lord Holmes is informed of Sean's escape by both his assistant Watkins (Fraser) and Sergeant Owens (Armstrong). Considering the complexity of Sean's transfer (Inspector Highland being the only person...
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