[ Required? Not really. Necessary for the sake of expedience? Absolutely. If not for the little push that Yelena gave him, they might still be waiting on the guard to finish considering his options. Even in answering, his reluctance to assist them is evident. She might have demanded more but the answer seems to have satisfied Wangji, so she lets it be. ]
We got what we needed. We can sneak past the rest.
PERHAPS
We got what we needed. We can sneak past the rest.