I suggest reading the novel, as well.
The scene where he steals the butterfly is much more interesting and shows off his stealth abilities, which was more than just standing quietly around the corner.
He also stole the butterfly after it was transferred to her people, because the auction house would be much more proactive in finding the thief since the item being stolen would affect their reputation.
So she was humiliated 3 times: that the item was stolen, that it was her own men who failed to guard it properly, and that she was made to apologize despite her intuition telling her he stole it.