Use fragments for rhetorical effect
Should 
you use fragments in your writing? Your high school English teacher almost certainly said “No!” and marked it with a red pen.
Fragments are okay if they serve a rhetorical effect, such as the realization of something. For example: She realized something was behind her. Something large. Something breathing heavily.
Still, fragments should be used rarely. For a rhetorical effect to be used effectively, it needs to stand out from the rest of the text.
Fragments need revising largely if they don’t really serve this effect or if they are confusing to understand because they weren't a complete sentence.
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