To have pushed so and hard distroyed so much for sword logic, he realised that existing after defeat would make him the ultimate hypocrite.
He was, after all, a being of principals, and unfortunately they got him killed in the first place.
It was a bittersweet ending.
The line "atleast the stars will remember the shape i gave them", is probably the best line the franchise has ever delivered.
Whether right or wrong, there will always be an indicator that he existed and maybe that's enough for anyone, regardless of who they are.
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The story has actually been pretty decent this episode, marred only by Bungie's inability to get themselves organised and actually complete the voiceovers. There's so much I've missed initially from this season because I haven't realised anyone is saying anything until another character starts responding to it. If it wasn't for Bungie's insistence on making all characters play through story beats, I'd probably have missed out on them completely. Bungie had plenty of time to organise workarounds for the strike action (after all, they did it for all the characters that [u]did[/u] speak and every other game developer managed to), so as much as you might like the writing, the only sound I'll remember from this season is the sound of the ball being dropped...hard...