Let this be a lesson to all beginner traceurs or people thinking of attempting parkour. Getting on a roof and doing life-threatening stunts is not parkour. This practice is all about being safe, smart, and working at your own level. Rooftop parkour is much more rare than depicted in a lot of videos and it's important that people understand what they're capable of and what they should try. This guy was very lucky. Go out and train but be safe!