Confront
You take your fingers and slam a lid on the table. You make this big noise to confront the person in front of you.
They weren't listening, which is why you slammed that lid down. You'll have to confront them more directly.
こう
あらが
None
You are trying to confront Emperor こういち. You're confronting him about all the kanji he's forcing you, and everyone else, to learn. "Look here こういち! I know you said I'd learn like 2000 kanji in no time, but this is way too efficient! What will the people do when they're done? Do you think they will sit idly by?"
こういち is laughing at you as you confront him. Which makes you angrier, so you bang the lid on the table some more.