happened to me a few days ago. wind wasn't too strong, so in a lull i disconnected the leash, unhooked and passed the bar up through where the lines split Y.
was uneventful and affective. BUT would not be trying this in the mid to upper wind range of the kite.
you have to have it planned out first - then do it quickly.
also you must realise if things don't go to plan you will be swimming after the kite.
expecting some flack from the fun police, but at the time there was no pull in the kite.