This guy know that the knowledge in this world is behind him and he expect the swordman to use combo perfectly? Man, maybe your brain died alongside with your heart.
There's something very wrong about that world! It's not a "real" world based on a game, it's still a game with NPCs following strict routines and restricted movements. Looks like the monsters are no better off. Quite disappointing. Even if the setting of the series is that the MC has a huge edge by knowing the game inside out, there would have still been splendid ways to make his knowledge and game experience count without making the world completely broken. Despite it being Broken Balance. The author is taking the easy way out.
@WillTell It's fine. The MC was lying to her, so it's all in balance. Not Broken Balance, just in balance.