Thanks Rick, I do land my kite with the leash if I can't hold it or in strong wind at the end of a session, the reason I didn't this time was that I wanted to relanch again without mucking up the lines as soon as I'd sorted the trim.
I got punished for being flash and lazy basically.
Yesterday I asked Toby to add this to the self landing guidelines in the infos section
DON’T try self landing a small kite on its leading edge in strong wind (over 15-20 knots) because even if you manage to land it the wind can get under it and make it take off again without warning and the kite can go looping very fast into the power zone spiraling out of control and dragging you behind it.
In strong wind if there’s no on there to catch the kite, release your depower shackle and let the kite go to the leash, with one hand on the leash release shackle to release it if the leash doesn’t work.