I am trying to replace a dome light with a nice small ceiling fan. When disassembling the old light, I notice an odd orange/clear clip connecting the lights ground to the house. What is this called, and how can I get it off? Can I reuse it, or do I need to cut the wires and get a new one?
The other wires were twisted together with one of the plastic twisty thing (bonus points if you can tell me the name of that twisty thing). I have a few extras, can I just use it to splice the new ground wire to the house?
Basically, what do I do here?

Notice that from the ceiling two copper wires are coming down and hooked in, and a very small (bottom left of black) is going from the light to the clip.
