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Ex-Formula One driver Antonio Pizzonia is speaking out following his recent assault arrest ... claiming while he regrets his actions, he was simply defending his son.
The 45-year-old former Jaguar and Williams star went to Instagram to share his side of the story on Monday ... stating he's "fine" and back home following his eventful weekend in Texas.

"There really was an incident which, today, I would have reacted to differently," Pizzonia said.