Lady Nora did not like to be given wrong info. When this guy did and she found out, she did not care whether he knew or did not know that the information he gave her was wrong. It was his duty to verify it before giving it to her and for that, she had to punish him. She did this and she used her foot domination to punish the guy.
Lady Nora had tried to pass some info to this guy but she did not manage to do so. She knew that the best way to deal with this loser was to use her foot domination fetish. She had to make sure that he got the info and that he realized how serious she was about it. So she trampled him with her boots to ensure he never forgot the lesson.