I'd like to do them legitimately, but Legendary since Halo 2 (which was the worst bullshit) has always had random bullshit moments to fuck you over entirely no matter how well you played up to that point or what's going on when playing for no-dying runs.

You know what I mean. Suicide grunts that make no noises until turning the corner they're standing at, a jackal that'll snipe you through a tiny crack with a needle rifle when you're otherwise hidden well and waiting on a shield to recharge, and fuel rod and conc-wielding elites with aimbots. The AI reacts so unpredictably to things that oftentimes there's no blanket, all-purpose strategy to keep yourself alive. Sometimes attrition while hiding works, other times enemies will bum rush you.