"My apologies for lying at that time. It's just that I didn't trust you enough to reveal my only trump card to you. Sacred grounds are isolated places. You have to have a last line of defense here, just like how you lied to me."
Vin made a very good point in his argument while pulling his fist out of the dead archer frog. But Mir was more interested in the second half of his logic.
"When did I lie to you?" He asked Vin, not really putting in the effort to sound indignant at the accusation. Since the truth was out, he didn't want to insist on a lie. He only wanted to learn how Vin had figured it out.