Phantom glitch on The Arbiter
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To see the 'Phantom Glitch on The Arbiter', as soon as you start the level The Arbiter, turn around and zoom in on the Phantoms. Then watch them, and shortly after they disappear into the clouds they will spin out of control one even crashing into a platform below. the other two will keep on falling till they hit the bottom of the level.
Also at the start of the video for that level, the Covenant Starships seem to be in the foreground (I.e. when the Phantoms go past the starships the Phantom appears to be behind them). You need to look closely but you can see it.
Also a little side-note, turn on subtitles, and read them as the Spec-Ops Leader gives his troops the battle speech. You will find a bit where Bungie haven't quite paid attention to the dialogue and the subtitles.
