He knew exactly what to strike at first, I mean his command ship, not the blood sucker thing that went to the traveler. No he knew to hit the tower and grab the speaker, specifically.
How did he know all of this info? I'm not chalking it up to bad story telling, as I feel the answer is some where in the game currently...like in the weapon/armor stories...or some lore tab.
For the hell of it, I would like to see how he was taken through the infinite forest, just as a mission to rescue him...it would be another strike...but just to hop in and protect him until you got him away from the fight, and all the way to the farm, far away from the battle.
Edit: stuff like war mantis is what I am talking about...they were dancing and the cabal were what? Confused?
Also, forget which piece, but we knew the psions that were watching a crucible training were bemused by the guardians complaining...did they go over to them and tell them that it was funny or something?
Edit 2: am I the only one that is impressed that the cabal carved a mountain in two...i mean for a base...but still, could've just hollowed it out. Lol just thought it was funny.
Last edit (for this post): use the infinite forest to find the stranger.
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My guess is that none of that stuff was secret and could be discerned from audio and video transmissions bouncing around the solar system. In D1 The Speaker even does a sort of wide-scale "Calling All Guardians" alert for a mission. I don't think The Speaker was hiding or that information security was/is a priority for the city. At least not a priority for undead Guardians.