Clara was seen in her room pacing up and down. She doesn't understand why she felt nervous after meeting with Mick's expression. She felt like she has wronged the man, and felt quite uneasy.
She knew she shouldn't be this way as a guardian, but she couldn't help but blame all her suffering and disappointment all this while on Leo. If not for the fact that she needed him; she would have stayed far away from him after getting her luck back.
She's angry with him because he was an arrogant man who sacked his employee unjustly. No one is above mistake, and she believed making a single noise does not justify his actions.
Since he could avoid the attack once he prepared himself for any sound to come, he should prepare himself when walking out as well.