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During a joint sting (against Fisk, an illegal arms dealer) involving the NCIS and the LAPD, Deeks appears to blow away a peripheral bad guy whom he believes to pack, but who in fact has no piece; Hetty fires Deeks after the LAPD cuts all its ties with the NCIS; when Deeks leaves the office, he and Kensi have a friendly chat. G and Sam spook Fisk's lawyer and then tail her; Deeks receives a request for help in smoking out a mole inside the LAPD; Kensi visits a suspect and describes a plan; Deeks goes out on a ledge; Kensi belatedly learns about a ruse; Deeks and Kensi go after whom they believe to be the mole, and G and Sam go after Fisk and some high explosives; slowly the team find out and figure out who's the mole, and who are the good guys. A SWAT team, along with G and Sam, grabs a bunch of bad guys; G, Sam, and Deeks dodge the flying debris and nail the real mole. Deeks returns to the NCIS, but he has trouble in talking with Kensi about a thing.