He just mocked Russoa...omg.
He just said, “that wasn’t noose” — that’s how the ‘s’ problem comes into play.
Linguistically, esses and zees are formed the same way, except that one is voiceless (s) and the other is voiced (z). brockos impediment is he seems unable to make the voiced sound (z) at the end of a word. Hence he says “noose” for “news”.