So I was talking to pomegranateandivy and I think I might have a slightly better way to explain some of this concept, since it’s pretty difficult. So we’ll give this a go and see how it works.
I’m going to refer to the natural state, without influence, as the ‘balance’ or ‘order’ from this point on. That’s just day to day life without Chaos user A (known as you or I for the sake of easy writing) doing any magic. [We can ignore minor things usually like good luck charms and protective wards]
Think of the balance as a pane of glass you are running your hand along: when you use magic, you exert pressure on this glass. When you do ordered magic, you gather your tools and time your strike, and use that to break or fracture the glass. It isn’t actually damaging, it just creates a new order, because the continuing pane of glass has been shaped by this tool. It can be jagged and messy, or it can be a nice, neat, cut, sanded and smoothed and all decorative. Point is, magic is exerted on the glass. For ordered magic, though timing and things might be important for your tool(can’t use an electric saw if it isn’t plugged in), where you do this on the pane of glass is, largely, irrelevant.
Back to Chaos and your hand on the glass. As your hand runs over the glass, as you feel and keep track of the order, you will notice imperfections, structural flaws and weak points that naturally occur. You might find natural cracks. Chaos magic is applying pressure to these weak points. You don’t know where they’ll be until you feel for them, but they mean you have to exert less force to change the glass or introduce new cracks.
Now, you don’t necessarily know how these cracks will form, because you are working with a natural weakness, as opposed to creating the break entirely on your own. You may push on a crack expecting it to fissure out and create more cracks, only for it to break fully.
To control that, you have to learn how to push on the crack, and how to identify what kind of weakness it is. What you use will affect the nature of the crack (there is still control, you can still use it for a specific purpose, you just need the knowledge to ensure the things you are using will be relevant to that purpose). It takes less energy, but it’s more circumstantial.
You can also push on different points of a crack. You can exert pressure in multiple ways. You can push from the inside or the outside. (That has a lot to do with intent and direction) Because Chaos magic is exploiting the weakness of the glass, rather than the strength or precision of your tool (though again that does still have bearing), it is a less than predictable form of magic.
That is, essentially, the very basic premise of how Chaos magic works, in my experience.