She had to act natural, Arianna couldn't give out to the intruder that she had noticed his presence and at the same time, figure out what to do. It couldn't be Marcel's men, they wouldn't sneak in through the window, but the door because they had been authorized to keep her safe.
Marcel had sent her here because he wanted to keep her safe from his father. And though he said Daniel couldn't offend Leon, he didn't exactly say this place was impenetrable. Arianna swallowed down thickly as she realized something, since her death couldn't be traced back to him, had Daniel hired an assassin after her?
What was she going to do? She needed help and for the first time, she regretted living in such a spacious room. Before she would run to the door, the assassin would have killed her already. What was she going to do? It dawned on Arianna that she was on her own here.