Here is an advanced rescue strategy from the Kiteboarder Magazine. Check out the full article here.
To retrieve a loose Slingshot kiteboarding kite, make sure you have a plan and can predict where the kite will go. If the kite is tumbling, don’t try to grab it until it settles down. Wait until the kite seems to be staying on the water.
1. Go downwind of the kite as you approach so that you won’t get into any line behind the kite.
2. As you pass the kite, look for a place to grab where you can control it.
3. Stay a little upwind of the kite so that your kite is pulling you away. This will help to avoid getting wrapped up in the loose kite.
4. The nice thing about grabbing a bridle is that you don’t need to flip the kite over. Simply pull the kite with you, and the wind will lift the kite above the water.
If the kite doesn’t have a bridle, you can grab a wing tip to stop the kite and then drift away from the kite and begin to help it flip over before you start to ride on your board. Either way, make sure you approach, observe, plan, and then proceed to grab the Best Kiteboarding kite. If it doesn’t feel right, just trust your instincts and let go of the kite.
this is a good step by step instructions, especially for all new kitesurfers.