Fragments. For some reason some people hate them. But I guarantee you that they are useful in writing a story. Plus, I guarantee you that done properly, and when not viewed in a program like MS Word that underlines them and calls bold attention to them, most people don’t even recognize the fragment is there.
Fragments are useful when writing dialogue because people normally speak in fragments from time to time. They are also useful for pacing. Fragments are fast. They can whiz by and speed up action.
So next time someone tells you not to use fragments in your writing, tell them thanks for the advice. Smile. Then let them be on their merry, little way.