When Zadornov (going by the name Ramón Gálvez Mena) and Paz Ortega Andrade approched Big Boss and Kazuhira Miller and their PMC the Militaires Sans Frontières with a mission. Big Boss was hesitant to take the mission, so Zadornov used his prosthetic hand to light Big Boss's cigar, as Big Boss' lighter was broken due to the rain. When Zadornov thought they were not going to do the mission, he toyingly put the tape of The Boss's voice over his lit thumb. Big Boss took the tape back and agreed to help them. Big Boss managed to deduce Zadornov's (then assuming the identity of "Ramón Gálvez Mena") affiliation with the KGB on his first meeting due to the prosthesis, noting that it was more fit for an assassin than for a supposed University of Peace professor.