Days after reaching a plea deal with federal prosecutors on his unpaid taxes and a felony gun charge in 2023, Hunter Biden appeared panicked and short-tempered, according to leaked footage from a new documentary about the former first son seen by The Post. “What are you talking about ‘I’m protected?” wide-eyed Biden animatedly says into a cell phone in the footage, from the documentary-in-progress being made by Hollywood writer and lawyer Kevin Morris, who loaned Biden more than $6.5 million