first of all you always have to check your gear before you go on the water.
make sure it works probably and before you get the kite up in the air, wash the sand of in the water. You should start the kite being in the water anyway.
If you use a snap shackle of minor quality, you endanger your life big time! Don't try save money on your life.....
Make sure you can detach your shackle as well from you totally.
I just saw the Kitebar-System from http://www.kiteproshop.com
working in Cabarete again. Two lines got tangled, first released the leash, than the beginner got scared due to the other kite involved and totally released from the kite:
It works and is simple.
Someone ask for the best 2003 bar before, this kitebar-system is my answer, specially if you look at the simple design und functions: