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About a hundred people had already gathered, a guard rail the only thing separating them from the crater's edge.

Is it not more proper to say "About a hundred people had already gathered, a guard rail was the only thing separating them from the crater's edge."?

It naturally sounds more clear in my opinion when was is used.

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This is an absolute nominative. That construction usually includes a nominal with a dependent adjectival phrase, but, as in this case, it can also include a nominal ("a guard rail") with a dependent appositive ("the only thing separating them from the crater's edge").

That construction is correct, but feel free to make it into a finite clause by adding "was". Just watch out for the comma splice (if you care about such things).

  • The “omitted” word would be being (a participle) — not was: About a hundred people had already gathered, a guard rail being the only thing separating them from the crater's edge. – Tinfoil Hat Jul 11 '23 at 02:44
  • @TinfoilHat Yes, inserting "being" would make it the more typical nominal + adjectival phrase. I only mentioned "was" because OP specifically asked about that in his question. – MarcInManhattan Jul 11 '23 at 03:24