From one of my favorite YouTube channels, Lindybeige, comes this video on why pushing swords is a movie convention and doesn’t happen in reality:
There’s one caveat to what he said—which otherwise I think generally correct: sometimes in fights you will see fighters pause with each other while both sides take a second to breathe. This is especially obvious in boxing where the two clinch and look like they’re hugging each other. It does seem possible, therefore, that two men having a duel—especially if they’re wearing mail and thus don’t need to worry about cuts to the body, only stabs—might both pause a moment in a position like this where they’re so close the other can’t generate substantial power. This actually ties into some thing which Llyod has said in other videos that people typically don’t like killing each other and often try to at least put it off if not outright avoid it. That said, this is a minor caveat and I think Llyod is correct.