I was watching this video, which briefly covers the first Halo (Halo Combat Evolved).
At 14:00 there is a confrontation before the monitor becomes an enemy in the game.
Who did the Monitor I assume incorrectly think that the Master Chief was, perhaps a forerunner? In the scene the Monitor was fairly confused, stating "But you already knew that… I mean, how couldn't you?" and "Last time you asked me, if it were my choice, would I do it?".
Best Answer
Guilty Spark refers to The Chief as "Reclaimer". This is an ambiguous title, not specific to any particular person.
Source
In the original game, the context is ambiguous, making this a little vague as to what or who he believes he is talking to. However, in the extended canon, it is made a bit clearer:
Source
So what we can take from this is that 343: Guilty Spark does not see the individuals, or even distinguish between two individuals, particularly in the role of the "Reclaimer".
Halo: The Flood by William Dietz p. 244