“The one who knocks is me.”
When he was conveying, well, I guess asserting a fact, he, Walt that is, usually opted for “given-before-new,” though of course that didn’t come without a stilt cost. After Skyler left the room, he would pore over that cadence with some regret, but ultimately feel justified in not compromising his linguistic dogma, which, when you put it that way, well, never mind.
A couple seconds pass. His wife gets up and leaves. A couple more seconds before he registers it; l’esprit d’escalier.
“And there are two ways of doing it, you know,” Walt would have continued. “You can rap your fist, or you can wait for someone to open the door into it.”