Thread:Prodigy X/@comment-18812574-20140312230302/@comment-1493741-20140313213847

The reason I use quotations when I say that they "pull" on a soul is because its a euphemism, they don't literally pull on the soul of something, they manipulate it. As Kugo demonstrated, he can manipulate the soul of a liquid in order to have it come to him rather than the typical method of just lifting the thing and drinking. Transformation of an object is just another form of manipulation, though in this case its harder to achieve, hence why the items they use are something they have an affinity with, a bond with that item that connects their souls and makes it easier to manipulate.

Say you had a lucky penny, you took it everywhere with you as a kid and it played some role in your imagination. Its exposure to you are memorized by its soul forming an affinity between you and the penny. Same goes for Tsukishima and Kuugo's Fullbrings.