If you are looking at quad line flying, or just getting into it, one of the things you quickly find out is that 4 lines is about 100 more than 2 lines. The opportunity for those 4 lines to get knotted up and end up looking like a birds nest is simply amazing. It seems the slightest thing will get them all tangled. Although there is no magic solution to this (shame) there are some things you can do to minimize the tangle syndrome - this is what I do on the Revolution and Deca kites (the C-Quad and other traction kites are done differently).
The golden rule with kites lines is this:
Anything that increases my flying time is worth doing.
That's it you have finished - hopefully there won't be any knots or tangles next time - and any that there are can be easily sorted.