Disgraced cycling star Lance Armstrong has finally come clean about years of doping. But one thing that seemed to be missing from his confession interview with Oprah Winfrey? Raw emotion.

That changed Friday night, the second part of the 2 1/2-hour interview. Armstrong cracked.

“I saw my son defending me and saying, ‘That’s not true. What you’re saying about my dad is not true,’” Armstrong told Winfrey.

That was the moment, he said, when he knew he had to tell the truth. He said his son never asked him if the drug allegations were true: “He trusted me.”

“And, uh, I told Luke, I said,” Armstrong started, before pausing for a long moment to compose himself. “I said, ‘Don’t defend me anymore. Don’t.’”

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