Fallout New Vegas Help(spoilers)

So I was sent to the REPCONN facility by Manny Vargas to clear the place of gouls , once I get there I get a new quest and I have to clear the basement of the nightkin . Do I have to finish this to satisfy Manny Vargus? I'm stuck .

I don't think so, but why WOULDN'T you do it?

Edit: Yes, you do.

You do. Its pretty easy as well, since there is markers for where you need to go. :D