Recall that Archer had said earlier "Know this".
I think that is supposed to be one of Archer's phrases, so Castor is mocking Archer when he uses it.
Scariest words in English: We’re from the federal government and we’re here to help. R. Reagan
Um could you provide a quote, I'm not quite sure what you're talking about.
"I really wish Gia and Claire had became Tanner" - Honeybeefine
Before I answer your question, can you please explain what you are conveying by adding "Um" to the start of your question?
Scariest words in English: We’re from the federal government and we’re here to help. R. Reagan
Meaning I am confused by your post because Troy wasn't in the scene where Archer said "know this".
"I really wish Gia and Claire had became Tanner" - Honeybeefine
Archer said at one point: You're right, but know this. You're a convicted felon on probation for harboring Castor Troy.
Castor says later: Know that, thank you, next question.
I'm presuming that "Know this" was an expression Archer used from time to time, and that scene was only one example. Since the two knew each other well, Castor knew this, and uses "Know that" to mock Archer.
Scariest words in English: We’re from the federal government and we’re here to help. R. Reagan
But how could Castor know about that when he wasn't in the room? Hell he was in a coma when Archer made that quote.
"I really wish Gia and Claire had became Tanner" - Honeybeefine
You ask:
But how could Castor know about that when he wasn't in the room? Hell he was in a coma when Archer made that quote.
I'm presuming that "Know this" was an expression Archer used from time to time, and that scene was only one example. Since the two knew each other well, Castor knew this, and uses "Know that" to mock Archer.