Yeah Natasha was missing an organ and junk, but they didn't continue fighting once their conversation turned. I wouldn't call that a stalemate, I'd call that an interrupted altercation in which neither party was even significantly injured.
This was also happening in Black Widow's own series in an early issue, and I always thought it looked like Elektra was jobbing to Natasha for story purposes. I've never seen Widow compete with other h2h fighters like Elektra has, or perform physical feats in Elektra's range. Didn't Bucky throw her down? lol