drivers rear regulator

[wasp9166]

girls x5, her mechanic tore door apart and has a part on order, i'd assume it's the regulator , but she made a mistake and pressed the window button, when she pressed up the window went down, and now i can't seem to get it all the way up at all, the cable is super tight , so my question is

can i just cut the cable? does the new regulator come with a new cable that will feed into motor?

or is detaching window from regulator the answer? my thinking was if i cut cable i could use a pair of vise grips on the slide to hold it up