Yeah, she should have said, "Please put down the knife."

"Oh, no? You won't put it down? Pretty please?"

"Hey! I said please, sir!"

"Please don't kill me sir. I'm asking you very nicely!"

Fuck that. Your comment is low-key sexist. The cop gave a fucking order. The guy spun and advanced toward her with a knife. Fucking game over. Why should she risk her life to give this fucking loser 18 chances to follow orders. Fuck that.