I had a leash accident. The 1st time I clipped my leash to my waist as opposed to my ankle. I went to try a jump in power up conditions (only been kitesurfing 4-5 months) but went wrong from the start. Was yanked hozizontally in the air whilst at the same time the board submerged. The leash stretch like hell and eventually the board (6'9 Onboard 1999) came flying out the water and wacked me on the shin. I thought I'd just badly bruise it as it was cold and numb and I had a 5 mm wet on. 15 minutes later I went ashore and notice blood covering my foot.
I ended up with 16 stitches. The board slit my leg creating a hidious wound from impact not slicing. And then it went septic to make matters worse.
At the time I put it down to the leash being on the waist and still wear a leash today probably foolishly. Attitudes have clearly changed since then.