Michael got tense knowing Henry would be absent for weeks or even months.
He might be able to handle Sarah because he believed that she would probably act more subtly even if Sarah turned out to be evil.
But Marlon was a whole different difficulty.
Because Marlon was very aggressive and somewhat unpredictable, who knew what would happen next if he decided to go and kill Dahlia or Kate?
"I can handle Sarah, Sir. But I don't think I can handle Marlon," Michael replied honestly, knowing it was better to be honest rather than overestimate himself and end up putting Kate or Dahlia in danger. "He is crazy and crafty at the same time."
"Don't worry, even though I won't be with Kate physically, I will reinforce the security around her. I'll make sure to surround her with plenty of invisible bodyguards. I will also change the usual cleaning lady to a trained woman enough to subdue a man in case she gets attacked."