[quote]How did the Flood get released on both the Forerunner mining installation[/quote] The Heretics released the Flood that were stored on the gas mine, it's not made explicitly clear but there is a Sangheili who, after first encountering the Flood, says: > [i]"Heretic fools! What have they done?"[/i] [quote]and on Delta Halo?[/quote] Covered in the 2008 Cold Storage reports. Penitent Tangent was suffering in a similar way to 343 Guilty Spark did from crippling loneliness, as such he began to deviate from protocol and his dereliction of duty resulted in a Flood outbreak that he did not contain. The Flood hijacked Installation 05's slipspace conduits and therefore could get anywhere they wanted on the ring, so their first port of call was the Library to ensure not only that they secured the Index but also infected any samples that were stored there. [quote]I thought that Installation 04 was the only installation with a Flood outbreak.[/quote] Nope. [quote]Also, how does the Gravemind get around? Is his resting place on Delta Halo?[/quote] Slipspace translocation grid. [quote]How does he grab Chief from the water after Chief kills regret?[/quote] As we see, his tentacles grab him. [quote]How does he get to High Charity?[/quote] Gravemind hijacks In Amber Clad and crashes it into High Charity. [quote]Did Bungie originally intend to kill Johnson in Halo CE?[/quote] CE was intended to be the only game. Back when Bungie started on Halo, they had no idea that the series would be as popular as it ended up being and so they had no plans for a sequel - they were planning to move onto a fantasy game which is largely what Destiny ended up being based off. So yes, Johnson's death was originally intended (directly or indirectly) to be permanent.