Final answer:
The impact of the flashback on the passage is that it causes the protagonist, Danielle, to feel dizzy and confused, leading her to quickly leave the gym. Additionally, running into the person who had yelled at her intensifies her distress.
Step-by-step explanation:
The passage describes the impact of a flashback on the protagonist, Danielle Hartman. The flashback takes her back to when she was 14 years old and was yelled at by her principal. This sudden recollection of a negative experience causes Danielle to feel dizzy and confused in the present moment, leading her to quickly leave the gym. However, as she exits the gym, she runs into the man who had once yelled at her, compounding her distress.