Shooting guns on a moon covered in a methane ocean (Titan) doesn't make sense either, it would ignite everything.
It's just Artistic License
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Such a moon like Titan has no Oxygen to ignite that stuff. Nothing burns without oxydant.
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Guns and ships... They both use combustion and you can see them both on titan in the trailer
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It's a game that ignores physics and logic. Both sides use ontological weapons that defy causality. It can't get ever more unrealistic. That's why it's insane to reason about anything in Destiny. If the devs wish somehing into being, it will be so.
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Then you agree. It's Artistic License.
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That's Traveler magic for ya.~