When Arby and 343i Guilty Spark try to warn Tartarus the Prophets have deceived him about the Halo rings and The Great Journey, Tartarus replies with [i]what you say is heresy![/i]
OK, he views Arby as a heretic for allying with the humans and dismissing the Prophets teachings [b]but[/b] what else would Tartarus expect Arby to be after the prophets secretly plotted with the Brutes an Elite genocide?
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Because Tartarus, being a Brute, was a shortsighted fool who figured that the Arbiter was trying to win back the Elite's favor in the eyes of the Prophets.