Heretic Leader suggested Arby to ask Guilty Spark about Halo and it's true purpose, Guilty Spark says [i]more questions? splendid, I'll be happy to assist[/i] than she's immediately cut off by a barriage of Plasma bolts fired by the Heretic Leader.
Why would he suggest to Arby to ask Guilty Spark about Halo if he was going to shoot him right after? If he wouldn't have opened fire on him, Arby could have learned the truth about Halo (then again, Arby still wouldn't have believed it the first time)
[b]Or[/b] what if he only suggested it so he can whip out his Plasma Rifles while Arby was temporarily distracted?
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This was also the first time we see the Hologram AA in Halo.