Each of these incendiaries is slightly difficult to throw perfectly, but this seems to be a very safe and quick strat, and there are tons of very quick incendiaries to grab on from 4-4 onwards. Once again, this is a bit of a niche category (no damage/no resets), but this is much, much, much faster than using a hand grenade on the lower door, climbing up the ladder twice, then killing the gunner.
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