Yes this happens almost all the time......
In fact all of us kiteboarders have been hit in the head many many times like this .........so much so, we cant decide if we should wear board shorts or wetsuits so if you see kiters wearing boardies over their wetsuit that is because they have been hit in the head by a launching kite...
I have been hit many times

did I mention this happens all the time........
I recommend you take your walks in the park from now on, it will be much safer ......or just stay under your bridge.