Staircase Shooter or Defensive Dad?

Overview

An angry confrontation leads to a 31-year-old father facing life behind bars, after shooting his ex-girlfriend's boyfriend in the leg. He insists he was defending his ex and their child from an intruder, after the ex-boyfriend broke into her home. But the incident was captured on video and the Prosecution believe it shows a violent attack. Is he an angry ex or a defensive dad?