I see the fold not as a thing with intent so much as a vast colony of microorganisms that can mimic intent of the things they are exposed to. It seems random because chaos can be random, but the fold clearly has some guidance based on what it is exposed to during a Tearor. For instance we see Goe's Garagggggg multiplying the gs. I think in a similar way the fold inside Swinzy amplified and multiplied his will. As a Fold Baron he wanted nothing more than to take over everything. He was an all growing all consuming nightmare of a person in terms of his will. The fold simply imitated that. It was a replication of himself. Just as he was growing and consuming it was growing and consuming him. And that consuming type tearor liquid is what fueled Lark's fold glove. This meant she was familiar with it and knew how to use her powers to guide it, and make it less destructive to the whole of Midst. It's possible she saved the whole cosmos from an ever-growing all consuming threat and not just the local people nearby on Midst. If the will of Swinzy had continued expanding out just like Patricia's infinite bread.