From: tcaz2 | #011
You took too long to go through the Omega 4 relay.
You only have time for 1 mission after it opens up (specifically it's there for Legion's loyalty mission)
I'm pretty sure I only did his mission after the Omega 4 Relay opened up and they still all died.
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~Halo Now you learn the mistake of challenging me.
http://img408.imageshack.us/img408/2734/hieis.jpg