Isaiah Austin — DEATH DEFYING DUNK … I’m Not Afraid of Marfan Syndrome

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3 months after his NBA dreams were dashed when he was diagnosed with Marfan Syndrome, Isaiah Austin is back on the court … proving he’s STILL one of the most explosive players in the country. 

The 20-year-ancient 7-footer — who was projected to be a 1st round pick in the 2014 NBA Draft — pulled out the video camera and recorded himself doing a…