Witness Charles McMillian, 61, broke down Wednesday afternoon after prosecutors played police bodycam video of George Floyd saying over and over that he couldn't breathe and calling for his mother.

The big picture: The reaction captured what we've seen from witness after witness — the trauma of reliving those harrowing moments on global television as America reckons all over again with one of its worst moments.

• McMillian was recorded on bodycam footage telling Floyd to take it easy.
• "You can't win," he told Floyd.

At one point in the testimony, McMillian dropped his head to the table. He composed himself for a second, held his head, grabbed a tissue and said: "Oh, my God." 

• He took a swig of water, still crying. He dabbed his eyes, then nodded his head for the questioning to continue.

Asked to explain what he was feeling, McMillian was barely able to say:

• "I feel helpless. I don't have a mama either, but I understand him."

Go deeper:

• Cashier says he felt "guilt" for accepting George Floyd's fake bill
• Off-duty EMT: I was "desperate" to help Floyd but "officers didn't let me into the scene"
• Witness who recorded George Floyd's death says she stays up at night "apologizing" to him
• 911 dispatcher testimony at Chauvin trial: "Something was not right"
• Prosecutors play 911 call at Derek Chauvin trial