Well ran obviuosly the newby made several mistakes. NEVER STAY ATTACHED TO YOUR LEASH WHEN ON LAND. ALWAYS DETACH WHEN WALKING UP THE BEACH ETC.
I use an Oceanus leash and it has made life sooo much easier, and at times less dangerous, as - in hairy situations - I am not focused on holding the board in one hand and only one hand on the bar, so I am focused where I need to be, on the kite.
These leashes are not fool proof as your ding-a-ling proves. It's not the leash at fault though just the knob that used it.
BTW I did have one dodgy situation that almost put me off using it but learnt from the situation (long story) and have had no probs since.

I forgot to add that I wear a Gath helmet as well, which I'd use even without a leash. Hey what can I say image doesn't blip on my radar... (no boardies over a wetsuit for me - that really is the funniest, girly, try-hard fashion ever). Living a long fun life, teaching my squids to surf/kite and not slamminmg my melon does blip though.