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Just2807 said..
Would pulling the center lines (or 1 center line, i saw some weird bars o.O ) without pulling the slacked line help too? Would it force kite to fall/float on it's back/reverse?
In reality your goal is to remove tension from the lines, and to remove shape from the kite. Pulling in any single line will remove tension from the other lines and remove the shape from the kite. Some lines are better than others.
You can also remove, or reduce, tension from lines by running towards the kite, or streamlining your body if you're in the water.
The specific lines to pull are not hugely important. Being aware of the causes and possible fixes of the problem is much more important. Once you understand that you can work through the problem you are in and come up with a series of solutions then implement them as best you can.
I prefer to pull the front lines because that is how my kite is designed to depower. I once broke both front lines mid jump so I had to pull in a single back line to depower the kite. That worked fine until I got to shallow water and had my feet on the ground and tension in the lines. I could no longer run forward because I was on a shallow reef. The kite would do a series of flops before settling back on the water. It was a bit like playing a big game fish. Wind in the lines. Ride out the flops. Wind in some more line. Flop some more.