It's a fantasy role-playing game.

DM: You are Beauregard Lionett called Beau, a human monk . You are the member of the famous group of adventurers. Previously, Nott tries to soothe the creature by singing like Toya did earlier to the  devil-toad,  with comically bad results. youregard is slow to react, still momentarily convinced that the zombie attack is a part of the act, but finally attacks the creature with a flurry of blows that knocks the zombie around.
DM: 17. You attempt with your first strike, and the creature just breaks away. Its strength is far more than you imagined it would be from what was originally an elderly-looking frame.
Player: I go, oh, fuck that. I don't know if that's true, and I'm going to do a flurry of blows and do two, pop-pop. That's unarmed, right? Pop-pop.
DM: That is correct.
Player: I do two, right?
DM: Yes, if you're using your ki point to do that, yes.
Player: Yes, I am. So first one, it's plus six? Okay. First one is 19. No, 20. First one is 20 total, and then the second one is 15 total.
DM: Both hit. Roll damage for each.
