Please help with finding part.

I added this question onto the repair guide, but I will also add it here since I am desperate. What is that yellow ribbon cable at the bottom to the side of the vibrate motor? I ordered a new screen and front frame, and while I was transferring things I accidentally punctured my battery. I had to get rid of the back frame, and it still had that part in it. I was too afraid of trying to get it out with the battery sizzling and sparking. The replacement front frame I bought doesn't have that in it, and I can't find it sold anywhere. Please someone help. You can see it on step 11