ouch... it happends... and no gear can really stop a break... I ride stunts like that.. first thing wrong was doing high chair and 50/50 with no hand brake... no covering your rear brake is the worst thing.. I used to never cover mine.. I would ride free way wheelies for miles on end with my right foot(brake foot) on the back seat cause it ws more comfy.. but once I learned the back brake I never tak my foot off.. I have a handbrake also so when I do take my foot off I cover my handbrake with my left hand... 1 finger on the clutch and 2 on the brake then my pinky on the grip... it works the best for me.... to show you that if you cover your rear brake you can never flip a bike... here enjoy...
http://www.desertvideo.com/videos/park.wmv this is me parking my bike.... but I feel bad for the kid... no matter how stupid you are with stunts you never want to see that happen... and that can happen on a harley or any type of cruiser as well... my buddy lost his leg on a cruiser... so all bikes are dangerous not just sport bikes.... when your on 2 wheels I could care less if it's cruiser or sport your still brave in my book