Found this in an attic today. Townhouse, end unit, this is the end attached to the neighbor.
Properly securing the firewall between the units…
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Fire block. Correct
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Yup, fire blocking between adjacent units for safety. 
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Doesn’t look like the job was done properly. One bay seems to be missing. If the town home does not have a parapet wall separation, 4’ of the underside of the roof each side of the wall needs protection.
R302.2.2 Parapets for Townhouses
Parapets constructed in accordance with Section R302.2.3 shall be constructed for townhouses as an extension of exterior walls or common walls in accordance with the following:
- Where roof surfaces adjacent to the wall or walls are at the same elevation, the parapet shall extend not less than 30 inches (762 mm) above the roof surfaces.
- Where roof surfaces adjacent to the wall or walls are at different elevations and the higher roof is not more than 30 inches (762 mm) above the lower roof, the parapet shall extend not less than 30 inches (762 mm) above the lower roof surface.
Exception: A parapet is not required in the preceding two cases where the roof covering complies with a minimum Class C rating as tested in accordance with ASTM E108 or UL 790 and the roof decking or sheathing is of noncombustible materials or approved fire-retardant-treated wood for a distance of 4 feet (1219 mm) on each side of the wall or walls, or one layer of 5/8-inch (15.9 mm) Type X gypsum board is installed directly beneath the roof decking or sheathing, supported by not less than nominal 2-inch (51 mm) ledgers attached to the sides of the roof framing members, for a distance of not less than 4 feet (1219 mm) on each side of the wall or walls and any openings or penetrations in the roof are not within 4 feet (1219 mm) of the common walls.
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Does it look right even if that missing bay was filled the same way as the rest of them?
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By the looks of the rest of the drywall which is sagging, tape coming loose, etc. It probably fell down. 
Thank you all.