There’s a lot in this one word.
The stage direction before says simply “They play.” It doesn’t describe the duel in any manner and a fight director has to work out what happens to allow Hamlet to earn this point. How does Hamlet, who has been described as the underdog in this contest by MULTIPLE characters, manage to score this point? And why does Laertes deny it?
All we have is “one” and that word is a window on a cascading list of questions.