The biggest flop in Halo 4 Canon is really how the hell are marines breathing in Space without some kind of EVA Suit or helmet in the Space Station mission. Where Chief sees the Composer for the first time. There's a breach in the Station intregrity and later in the mission Covies come straight through it. No depressuration and no lost of atomsphere.
Try to explain some kind of reasoning to me
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Because they've inherited the badass capabilities of Sgt. Johnson (minus teleporting, resurrection, and invincibility), who can be seen breathing in space on Cairo Station.