Dead City 2 is a very small level, it consists only of the last Dead City 1 office building basement and an adjacent courtyard.
Following a reunion with Bourbon, the pair crosses the last leg to Dry Station. As they approach they are blocked by both a Demon and a pack of watchers. The pack can summon other pack members in addition to the scripted ones. If not taken out quickly by the player the impending fight might escalate into a literal bloodbath and become very hard to win. As such it's not recommended to hoard ammunition for later. Pending their success in repelling the watchers, Artyom and Bourbon flee the battle and make entry into Dry Station.
There are two demons that can be seen towards the end. One in the street, and one on a building observing the battle. If the player manages to kill the first demon then the other one will take its place.
Probably due to an AI coding oversight, Bourbon aims much higher than he should, resulting in his uselessness in the fight with the pack of Watchers.
Compare this fight with the similar one at the end of Anomaly level. Khan is absolutely devastating and is capable of taking the whole horde of nosalises out all by himself.
It is possible for Bourbon to die here, do your best to keep this from happening.
Several buildings have open windows and doors leading to apartments blocked by slabs of concrete. The level might have been intended to be much bigger.
Both the lack of an introductory narrative and its name hint that Dead City 1 and Dead City 2 seem to have been one single level originally, which was unevenly split in two at some point of development. This may have been done for loading purposes.
In the Metro 2033 Redux, Dead City 1 and Dead City 2 have merged into a single level.