In episode one of the National Geographic documentary The Savage Kingdom, there is this line which you hear said (and see in the subtitles) there:
Leopard Rock is fortress and home.
The line reads well, but I am just curious what the phenomenon here is whereby one is permitted to drop the article a or the before nouns fortress and home yet still remain grammatical.
If it were fortress alone, I think it should be:
Leopard Rock is a fortress.
since fortress is a countable noun.
What makes it special and OK to omit the a or the here?