The author used a comma in the following text; I would have used a colon. Any thoughts?
"She is one of only a few lawyers with the necessary skills to advise on such deals[:][,] a significant achievement for a mid-level attorney."
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The Oxford Manual of Style lists one of the uses of the colon as:
The colon points forward: from a premise to a conclusion, from a cause to an effect, from an introduction to a main point; from a general statement to an example. It fulfils the same function as words such as namely, that is, as, for example, for instance, because, as follows, and therefore.
None of these seem to be the case here, although I can understand the temptation to assume that it is. I suspect that the author is correct.