Eu sempre achei que era Clu , ele perdeu quando o tanque foi destruído:
As Clu attempted to get away, he was ambushed by a Recognizer. Clu fired at it and successfully destroyed it, but its remains rained down on Clu's tank. The vehicle went out of control as the blast radius lifted the tank to its side and crashed into one of the many walls in the maze of the memory sector.
E no artigo Reconhecimento de Flynn sobre Tron Wikia.
In the novelization, the pieces that form this Recognizer are the remains of one of the Recognizers Clu destroyed in the beginning of the movie.
Então eu suponho que apenas seguiu Flynn quando ele o viu, pensando que era Clu.