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Martin, a Cup Foods store clerk, expressed guilt and regret for reporting the counterfeit $20 bill to the store manager. His boss told Martin to confront Floyd, and when Floyd refused to come back into the store, a coworker was instructed to call the police. When he asked what was going through his mind during Floyd's arrest, he responded \"disbelief and guilt.\"

He seemed to partially blame himself for Floyd's death.

\"If I would have just not taken the bill, this could have been avoided,\" Martin said.

Alyssa, another witness, also was 17 the day Floyd died. She cried on the witness stand as she re-watched video footage of Floyd's arrest.

\"I was powerless there,\" she said. \"I felt like I was failing him.\"

Though not everyone who witnessed Floyd's arrest may be experiencing PTSD or relates symptoms, the disturbing images of the event can still affect their mental health, especially as they revisit and explore traumatic memories, Cohen noted.

\"This has maybe affected the arc of their life,\" Cohen added. \"For people who witnessed George Floyd's death, I would definitely think that they should all be aware and if they have any concerns go to a mental health professional.\"

ABC News' Bill Hutchinson contributed to this report.

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